Thomas Boone Quaid is the son of actor Dennis Quaid and real estate professional Kimberly Buffington. Born in 2007, he has a twin sister, Zoe Grace Quaid, and an older half-brother, actor Jack Quaid.
Interest in Thomas comes partly from his famous family. His name also became widely known after he and his sister survived a serious medication error as newborns. Their experience later led their parents to speak publicly about patient safety.
Much of his life has remained private. The clearest account of his background comes from family interviews, birth announcements, and public records about the hospital incident.
Who Is Thomas Boone Quaid?
Thomas Boone Quaid is one of Dennis Quaid’s three children. He and Zoe are the actor’s children with his former wife, Kimberly Buffington. Jack, Dennis’s eldest son, was born during his marriage to actress Meg Ryan.
Thomas Boone Quaid became the subject of news coverage shortly after birth because of a hospital overdose that affected both twins. His parents later discussed what happened in interviews and congressional testimony.
Unlike his father and older brother, Thomas does not have a publicly established acting career in the sources reviewed for this article. His family connection explains much of the public interest in him, but it does not establish his own career plans.
His Birth, Age, and Early Life
Thomas was born on November 8, 2007, in Santa Monica, California. The family’s birth announcement confirmed that he and his twin sister arrived through a gestational carrier. The announcement identified Dennis and Kimberly as their biological parents.
Thomas arrived at 8:26 a.m., two minutes before Zoe. He weighed 6 pounds, 12 ounces, while his sister weighed 5 pounds, 9 ounces. These details were reported at the time of their birth.
As of November 5, 2026, he is 18 years old. His nineteenth birthday falls on November 8, 2026.
The twins’ arrival made Dennis a father of three. Although their birth attracted attention because of his film career, the much larger news story came later that month, when both babies needed hospital treatment.
His Parents, Dennis Quaid and Kimberly Buffington
Dennis Quaid is an actor whose films include The Parent Trap and The Rookie. Kimberly Buffington was described in contemporary wedding coverage as a Texas real estate professional.
The couple married on July 4, 2004, in Montana. According to the actor’s spokeswoman, they had met the previous year through a mutual friend at a dinner in Austin, Texas. Dennis’s son Jack served as best man at the wedding.
Their marriage later ended in divorce. Kimberly filed in 2016, and the divorce became final in 2018. The distinction matters because some biographies incorrectly describe 2016 as the year the divorce was completed.
Reporting on their settlement described shared legal and physical custody of the twins. Those arrangements concerned their upbringing as children and should not be treated as a description of their lives as adults.
His Twin Sister and Older Half-Brother
Thomas’s twin sister is Zoe Grace Quaid. They share the same parents and birthday, and both were involved in the 2007 hospital incident. News reports often discuss them together because their early medical experiences were closely connected.
His older paternal half-brother is Jack Quaid, the son of Dennis Quaid and Meg Ryan. Jack was born in 1992, about 15 years before the twins. He later became an actor, with roles in The Hunger Games and The Boys.
One family detail is often confused online. Meg Ryan’s adopted daughter, Daisy, is Jack’s sister through his mother. She is not Thomas’s sister. Thomas Boone Quaid and Jack share Dennis as their father, while Jack and Daisy share Meg as their mother.
These relationships explain Thomas’s place in the Quaid family without assuming anything about private family bonds. Public information identifies his relatives, but it offers only a limited view of their everyday relationships.
What Happened at Cedars-Sinai?
In November 2007, Thomas Boone Quaid and Zoe were admitted to Cedars-Sinai Medical Center in Los Angeles for treatment of staph infections. A later court opinion also records the infections as the reason for their hospital stay.
According to their parents’ congressional testimony, the twins needed intravenous antibiotics. A small amount of a heparin product was intended to keep their IV lines clear. Instead, they received a much stronger dose of the blood thinner.
Dennis testified that each baby received 10,000 units rather than the intended 10 units, a difference of 1,000 times. He also said the mistake happened twice during an eight-hour period. The overdose placed both infants in danger.
The important distinction is that the twins entered the hospital because of an infection. The medication error occurred during their treatment. Heparin was not being used to cure the staph infection itself.
Recovery After the Medication Error
Both twins survived the overdose. In his 2008 testimony, Dennis described how their blood-clotting measurements eventually returned to the normal range after a prolonged period of concern.
Later reporting stated that Thomas Boone Quaid and Zoe recovered and were discharged by early December 2007. Their recovery allowed the family to return home after an experience that had brought them into national news coverage.
By April 2010, coverage of Dennis’s patient safety work described the twins as active and energetic children. That provides a dated account of how they were doing several years after the incident. It does not provide access to their present medical records.
A careful biography can explain that the twins survived and recovered without making broader claims about Thomas’s current health. His private medical information should not be filled in with guesses.
How the Incident Led to Patient Safety Work
Following the overdose, Dennis and Kimberly established The Quaid Foundation to raise awareness about medical errors. Their public work focused on preventing other families from facing similar harm.
Dennis brought the family’s experience before a U.S. House committee on May 14, 2008. His testimony addressed the overdose and the legal rights of patients harmed by prescription drugs. The hearing placed the twins’ experience within a wider discussion about drug safety and accountability.
He continued speaking about safer care in later years. At the National Press Club in April 2010, he discussed medical error prevention and a national alert effort intended to share warnings about serious medication mistakes.
The family’s story also appeared in Chasing Zero: Winning the War on Healthcare Harm, a 2010 documentary about families affected by medical errors. Thomas’s connection to this work comes from his experience as a patient; the public advocacy was carried out by his parents.
Growing Up With a Famous Father
Dennis has occasionally spoken about fatherhood while keeping many details about the twins private. In a 2018 interview, he said being a parent had helped him focus less on himself and develop greater patience.
In July 2023, he also spoke warmly about all three children and expressed pride in Jack, Thomas Boone Quaid, and Zoe. These comments offer a small, direct glimpse of how he describes his role as a father.
They do not reveal Thomas Boone Quaid’s own views about growing up in a famous family. There is limited public material in which he discusses his childhood, interests, or goals in his own words.
That leaves a clear boundary for a biography. His father’s interviews can help explain the family background, but they cannot support claims about Thomas’s personality, feelings, or future choices.
Education and Plans After High School
A May 2026 report stated that Thomas Boone Quaid planned to attend the University of Colorado Boulder after high school. The report attributed that information to his social media account. It described Zoe as planning to attend the University of Virginia.
This supports a reported college plan at that time. It does not independently confirm that Thomas later enrolled, began classes, or selected a particular course of study.
The available sources do not establish his major, academic results, or long-term profession. Claims that he is already pursuing an acting career, running a business, or following a specific professional path would therefore go beyond the evidence.
There is also no reliable basis here for a personal net worth figure. His father’s earnings and the financial terms of his parents’ divorce should not be presented as Thomas’s own wealth or income.
Final Thoughts
Thomas Boone Quaid is known publicly as Dennis Quaid and Kimberly Buffington’s son, Zoe Grace Quaid’s twin brother, and Jack Quaid’s younger half-brother. His early life drew attention after he and Zoe survived a serious hospital medication error.
That experience became part of his parents’ patient safety work. Beyond this well-documented event and his family background, much of his life remains private. An accurate account of his story respects those limits while clearly explaining the facts that are publicly known.
(FAQs)
Who is Thomas Boone Quaid?
Thomas Boone Quaid is the son of actor Dennis Quaid and Kimberly Buffington. He is the twin brother of Zoe Grace Quaid.
How old is Thomas Boone Quaid?
He was born on November 8, 2007. As of November 5, 2026, he is 18 and will turn 19 on November 8.
What happened to Thomas Boone Quaid as a baby?
He and his twin sister accidentally received a serious heparin overdose while being treated for staph infections at Cedars-Sinai Medical Center in 2007. Both survived.
Is Thomas Boone Quaid related to Jack Quaid?
Yes. Jack is his older paternal half-brother. They share the same father, Dennis Quaid, and have different mothers.
Where does Thomas Boone Quaid go to college?
A May 2026 report said he planned to attend the University of Colorado Boulder. The available evidence establishes a reported plan rather than independently confirmed enrollment.
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