Thomas Boone Quaid: Who He Is, the 2007 Health Scare, and Life After High School

Thomas Boone Quaid is the younger son of Hollywood actor Dennis Quaid and real estate professional Kimberly Buffington. He was born on November 8, 2007, in Santa Monica, California, along with his twin sister, Zoe Grace Quaid, and he is the younger half-brother of actor Jack Quaid. Most people know his name because of two things: his famous family, and a serious medical emergency he survived as a newborn. Today he is 18 years old, he graduated from high school in June 2026, and he has started college at the University of Colorado Boulder, where he is studying business.

That short version covers the facts most readers are looking for. The rest of this guide fills in the story behind them: what happened to Thomas and Zoe in their first weeks of life, what changed because of it, how the family handled the spotlight, and what is — and is not — actually known about him today.

The Short Answer

If you only need the key facts, here they are:

• Full name: Thomas Boone Quaid
• Born: November 8, 2007, in Santa Monica, California
• Parents: Dennis Quaid (father) and Kimberly Buffington (mother)
• Twin sister: Zoe Grace Quaid, born two minutes after Thomas
• Half-brother: Jack Quaid, actor, born in 1992 to Dennis Quaid and Meg Ryan
• Age: 18 years old in 2026 (he turned 18 on November 8, 2025)
• Education: Graduated from high school on June 3, 2026; now studying business at the University of Colorado Boulder
• Career: No confirmed professional acting career or public career of any kind
• Net worth: No reliable public figure exists for Thomas Boone Quaid personally

Thomas was born through a gestational carrier, four weeks premature, and he and Zoe were healthy enough to go home after three days. Eleven days later, both babies were admitted to Cedars-Sinai Medical Center in Los Angeles with staph infections, and during treatment they were accidentally given a dose of the blood thinner heparin that was about 1,000 times stronger than intended. Both twins survived and recovered, and the incident became one of the most widely discussed medication-error cases in the United States. Their father went on to become a public advocate for patient safety.

Who Is Thomas Boone Quaid?

Thomas Boone Quaid is the younger son of Dennis Quaid, the veteran American actor, and his former wife, Kimberly Buffington. He was born on November 8, 2007, in Santa Monica, California, along with his fraternal twin sister, Zoe Grace Quaid. The twins were born through a gestational carrier, and according to testimony Dennis and Kimberly Quaid later gave to Congress, they arrived four weeks premature but were initially healthy.

PEOPLE reported the small details of the birth: Thomas was born first, at 8:26 a.m., weighing 6 lbs. 12 oz., and Zoe arrived two minutes later at 5 lbs. 9 oz. Those details come from PEOPLE’s profile of Dennis Quaid’s children, which is the most authoritative published source on the family.

His father, Dennis Quaid, was born on April 9, 1954, in Houston, Texas, and has worked in Hollywood since the late 1970s. His films include The Right Stuff (1983), The Big Easy (1986), The Parent Trap (1998), The Day After Tomorrow (2004), and Reagan (2024). His mother, Kimberly Buffington, built a career as a real estate professional in Texas. Dennis married Kimberly on July 4, 2004, at his ranch in Paradise Valley, Montana.

Thomas also has an older half-brother, Jack Quaid, born on April 24, 1992, to Dennis Quaid and actress Meg Ryan. Jack followed his parents into acting and is best known for playing Hughie Campbell in The Boys, voicing Ensign Boimler in Star Trek: Lower Decks, and appearing in films including The Hunger Games, Scream (2022), and Oppenheimer (2023). The 15-year age gap between Jack and the twins means Dennis experienced fatherhood at very different stages of his life and career.

Dennis Quaid’s older brother, Randy Quaid, is also an actor, known for roles in National Lampoon’s Vacation and Independence Day. So Thomas grew up in a family where acting was the family business on his father’s side — but he has not followed that path himself, at least not publicly.

The 2007 Heparin Overdose

The event that made Thomas Boone Quaid’s name known to the public happened when he was only 11 days old. It is worth telling carefully, because the facts are well documented and the story matters beyond celebrity news: it changed how hospitals handle medication safety.

When the twins were 11 days old, their mother noticed irritation around Thomas’s umbilical area and around Zoe’s finger. Their parents took them to their pediatrician, who sent them to Cedars-Sinai Medical Center in Los Angeles. Tests showed both babies had staph infections and needed hospital treatment with intravenous antibiotics.

During that treatment, the twins were supposed to receive Hep-Lock, a low-dose form of the blood thinner heparin containing 10 units per milliliter, used to flush their intravenous lines. Instead, they were given heparin at a concentration of 10,000 units per milliliter — about 1,000 times the intended dose. The overdose happened twice within an eight-hour window. The cause, as later investigations described it, was a chain of failures: adult-strength vials of heparin had been placed in the same storage bin as the pediatric-dose vials, and a nurse retrieved a vial without verifying the label against the intended dose.

The effect was immediate and dangerous. Heparin reduces the blood’s ability to clot, and at that concentration the twins began bleeding seriously. Doctors gave them protamine, a drug that reverses heparin’s effect, and kept them under intensive monitoring. According to Dennis Quaid’s account, the episode lasted roughly 41 hours from the first overdose until the twins were stabilized. About two weeks after the overdose, both Thomas and Zoe were discharged from the hospital, and later medical testing found no lasting physical harm — an outcome their doctors described as fortunate given the severity of the error.

The California Department of Public Health investigated the incident and described it as involving multiple failures in medication safety procedures, including failures to check product labels and weaknesses in handling and documentation of high-risk medications. The case was not an isolated event, either. Reports at the time noted that other infants had been affected by similar dosing errors at hospitals across the country, which made the Quaid case a high-profile example of a wider problem.

What the Incident Changed

The overdose did not stay a private family crisis. Dennis and Kimberly Quaid chose to talk about it publicly, and that decision had lasting consequences.

In May 2008, Dennis and Kimberly testified before a U.S. House committee about their experience. Their testimony described how the newborn twins were harmed by what the family characterized as a medication error, and it focused on the wider question of how medication errors happen and how hospitals can prevent them. Dennis later said the experience changed how he thought about hospitals. He had once assumed that doctors and nurses would always catch mistakes before they reached a patient. The twins’ case showed him that even complex healthcare systems are vulnerable to human and organizational errors.

The Quaids established the Quaid Foundation, an organization intended to raise awareness about preventable medical errors and push hospitals to adopt safer practices, including bedside barcode scanning that matches medications to patient wristbands before they are given. Dennis also appeared on CBS News and 60 Minutes to discuss preventable medical errors, and he narrated the 2010 Discovery Channel documentary Chasing Zero: Winning the War on Healthcare Harm, which profiled families affected by medical mistakes.

There were legal consequences as well. The family filed a lawsuit against Baxter Healthcare, the manufacturer of the heparin products, arguing that similar packaging between the adult and pediatric formulations contributed to the mix-up. In December 2008, the Quaids reached a $750,000 settlement involving the hospital after the medication error. A 2009 Illinois appellate court opinion also records the lawsuit Dennis and Kimberly Quaid brought on behalf of their twins following the hospitalization.

It is important to keep one distinction clear. The medical emergency is a documented part of Thomas’s childhood, but it happened when he was an infant. There is very little public information about how he personally views the event today, and it would not be fair to put words in his mouth about it. Almost everything known about the incident comes from his parents, from official records, and from reporting at the time.

Family, Divorce and Growing Up Away From the Spotlight

Thomas and Zoe grew up largely away from Hollywood, even though their father is a major actor and their half-brother became one. That privacy was a deliberate choice by both parents, and it has held for most of their lives.

Dennis and Kimberly’s marriage went through a long and public breakdown. Kimberly first filed for divorce in March 2012 but withdrew the papers the following month. A second separation followed in October 2012, Dennis filed for divorce that November, and the couple reconciled in 2013. They separated for good in June 2016, and the divorce was finalized on April 27, 2018. Both parents share custody of Thomas and Zoe, and Dennis has spoken publicly about the importance of cooperative co-parenting. Dennis later married Laura Savoie on June 2, 2020, in Santa Barbara, California.

The twins split their time between California and Texas as they grew up. Their upbringing was intentionally low-key: Dennis and Kimberly both prioritized giving the children as normal a childhood as possible, shielding them from paparazzi and tabloid attention. Thomas has rarely appeared at Hollywood premieres, award shows, or entertainment events in the way his father and half-brother have, and he has not built a public social media presence. Any social media account claimed to be his should be treated as unverified unless it has been clearly authenticated, because there is no established public record of one.

That privacy extends to his schooling. The names of his elementary and secondary schools, his grades, his favorite subjects, and his detailed academic record have not been publicly established. That lack of information should not be confused with a lack of achievement. Dennis has spoken positively about his younger children’s schooling over the years, and in 2026 Thomas reached the major milestone of graduating from high school.

High School Graduation and College in 2026

The most recent chapter of Thomas Boone Quaid’s story is the one with the freshest reporting, and it comes from PEOPLE, which has covered the family for years.

Zoe graduated from high school on May 23, 2026, and Thomas graduated on June 3, 2026, at a ceremony in Los Angeles. Both parents attended Thomas’s graduation and posed for photos together. Although the former couple sat separately, Dennis attended alongside his current wife, Laura Savoie, as they celebrated their son’s milestone.

On May 20, 2026, Dennis had filed a petition to end his $13,750 monthly child support payments to Kimberly Buffington following the twins’ high school graduations, according to court documents obtained by PEOPLE.

Both twins are now studying business. Zoe is attending the University of Virginia, and Thomas is enrolled at the University of Colorado Boulder. In August 2026, Dennis told PEOPLE that he had just dropped the twins off at college. “My twins, they just started college. Dropped them off last week, in fact,” he said. “They’re out there on their own now. They’re just starting out and you think, how are they gonna make their way? And then they do.”

The advice he says he has given them is the same advice he tries to follow himself: “Find something that you love to do, and then figure out a way to get paid for it. And you’ll never work a day in your life.”

It is worth noting that some older articles about Thomas still describe him as 16 or 17 years old, or say he is still in high school. Those articles are out of date. He turned 18 on November 8, 2025, graduated in June 2026, and started college in the fall of 2026.

Is Thomas Boone Quaid an Actor?

No publicly established professional acting career is associated with Thomas Boone Quaid. That is especially noticeable because both his father and his older half-brother have careers in acting, and because many children of actors do follow their parents into the business.

Thomas has made no public statements about pursuing acting, and there is no confirmed information about him chasing any specific career path. At 18, he is at an age when plans can change significantly. He may choose entertainment someday, or he may pursue something completely unrelated — his choice of business as a college subject suggests he is keeping his options open rather than following the family trade.

It would be unfair to assume he will eventually become an actor simply because of his family. Comparing him directly with Jack is not particularly useful either. Jack chose acting and built a public professional identity. Thomas has so far chosen a much quieter path, and the public record supports that choice rather than any career in entertainment.

What Is Not Known About Thomas Boone Quaid

Honest biographies say what they do not know, and with Thomas there is quite a lot that is not publicly established. Here is what you should not believe without a reliable source behind it:

• Net worth: There is no reliable public figure for Thomas Boone Quaid’s personal net worth. Some celebrity websites assign large dollar amounts to celebrity children based on their parents’ estimated fortunes, but that approach is misleading. Dennis Quaid’s income and wealth are separate from Thomas’s personal finances, and Thomas has no publicly documented acting career or business from which an independent fortune could reasonably be calculated. Any exact net worth figure attached specifically to Thomas should be treated with skepticism.
• Social media: There is no authenticated public social media presence established for Thomas. Accounts and handles that appear on gossip sites are unverified, and they should not be treated as his.
• School names and grades: The schools Thomas attended and his academic record have not been publicly established.
• Dating life and friendships: There is no substantial public record about Thomas’s dating history, close friendships, daily routine, or personal interests.
• Hobbies and future plans beyond college: Beyond the fact that he is studying business at the University of Colorado Boulder, his personal interests and long-term plans have not been publicly confirmed.

The pattern here is consistent: the public record covers his birth, the 2007 medical emergency, his family, and his education milestones, because those are the parts of his life that became public through his parents and through major reporting. The rest of his life has stayed private, and that appears to be how he and his family want it.

How to Check Facts About a Celebrity’s Child

Because Thomas Boone Quaid is a young adult who did not choose fame, the internet around him is full of thin articles, outdated pages, and invented details. If you are reading about him — or about any celebrity’s child — a few quick checks will help you separate what is real from what is made up:

• Check the date on the article. Many pages about Thomas still say he is 16 or 17, or that he is still in high school. He turned 18 in November 2025 and graduated in June 2026. An article that gets his age wrong is probably copying old material.
• Look for a named source. The reliable facts about Thomas come from PEOPLE’s reporting, from his parents’ congressional testimony, and from court records. A claim that cites no source at all — especially a net worth figure or a social media handle — is a claim, not a fact.
• Be suspicious of exact numbers. A precise net worth, a height, or a salary attached to a private young adult with no public career is almost always invented. Real reporting says when a number is unknown.
• Watch for lookalike pages and fake accounts. Gossip sites and fan pages often present themselves as official sources. If a site looks unfamiliar or makes big claims without evidence, use the same checks you would use for any unfamiliar site — see how to check whether a website is a scam before you trust what it says or share anything from it.
• Compare two or three sources. If three different guides agree, the fact is probably solid. If only one site says it, treat it as a claim, not a fact.

Frequently Asked Questions

Who is Thomas Boone Quaid?

Thomas Boone Quaid is the son of actor Dennis Quaid and real estate professional Kimberly Buffington. He is the twin brother of Zoe Grace Quaid and the younger half-brother of actor Jack Quaid.

When was Thomas Boone Quaid born?

Thomas Boone Quaid was born on November 8, 2007, in Santa Monica, California. His twin sister, Zoe Grace Quaid, was born two minutes later. He turned 18 on November 8, 2025.

How old is Thomas Boone Quaid?

Thomas Boone Quaid is 18 years old in 2026.

What happened to Thomas Boone Quaid as a baby?

When Thomas and his twin sister were 11 days old, they were hospitalized at Cedars-Sinai Medical Center in Los Angeles with staph infections. During treatment, they were accidentally given heparin at about 1,000 times the intended dose — 10,000 units per milliliter instead of 10 units. Both twins were treated with protamine, recovered, and were reported to have suffered no lasting complications.

Who is Thomas Boone Quaid’s twin sister?

His twin sister is Zoe Grace Quaid. The twins were born on the same day in 2007 through a gestational carrier. Zoe graduated from high school on May 23, 2026, and is studying business at the University of Virginia.

Who is Thomas Boone Quaid’s older brother?

His older half-brother is Jack Quaid, the actor known for The Boys and The Hunger Games. Jack is the son of Dennis Quaid and actress Meg Ryan, born on April 24, 1992.

Where does Thomas Boone Quaid go to college?

Thomas Boone Quaid is studying business at the University of Colorado Boulder. He graduated from high school on June 3, 2026, and started college in the fall of 2026.

Is Thomas Boone Quaid an actor?

No. There is no confirmed professional acting career associated with Thomas Boone Quaid. Unlike his father and half-brother, he has stayed out of the entertainment industry so far.

Does Thomas Boone Quaid have a net worth?

There is no reliable public figure for Thomas Boone Quaid’s personal net worth. He has no public career from which one could be calculated, and figures on gossip sites are not trustworthy.

Bottom Line

Thomas Boone Quaid’s story is really two stories. The first is the one the public knows best: a baby born into a famous family who survived a frightening hospital error at 11 days old, an event that pushed his father into patient safety advocacy and changed how hospitals think about medication errors. The second is the quieter one: a young man who grew up largely out of the spotlight, finished high school in June 2026, and started college at the University of Colorado Boulder to study business.

What makes his story different from most celebrity children is that fame has happened around him rather than through him. His father is a major actor, his half-brother is a successful one, and even his birth became national news — yet Thomas himself has stayed mostly out of the public eye. At 18, he is beginning to have the chance to build an identity that is not based only on being Dennis Quaid’s son. For now, the honest version of his story is a short one: a twin, a survivor, a recent graduate, and a college freshman whose next chapter is his own to write.