Thomas Boone Quaid is the son of American actor Dennis Quaid and his former wife, Kimberly Buffington. Born alongside his twin sister, Zoe Grace Quaid, in November 2007, Thomas grew up in a family closely connected to Hollywood but has largely stayed outside the entertainment business himself. His early life became widely documented after he and Zoe survived a serious medication error as newborns at Cedars-Sinai Medical Center. Nearly two decades later, Thomas reached a very different milestone: he graduated from high school in 2026 and began his college years at the University of Colorado Boulder.
Thomas Boone Quaid Quick Facts
| Detail | Information |
|---|---|
| Full name | Thomas Boone Quaid |
| Date of birth | November 8, 2007 |
| Age | 18, as of September 2026 |
| Birthplace | Santa Monica, California, United States |
| Father | Dennis Quaid |
| Mother | Kimberly Buffington |
| Twin sister | Zoe Grace Quaid |
| Older half-brother | Jack Quaid |
| Education | High school graduate; attending the University of Colorado Boulder |
| Known for | Being Dennis Quaid’s son and surviving a serious medication error as a newborn |
Thomas and Zoe were born in Santa Monica through a gestational carrier. Dennis Quaid and Kimberly Buffington are their biological parents. Thomas arrived first, with Zoe born two minutes later. Contemporary coverage confirmed the births on November 8, 2007.
Who Is Thomas Boone Quaid?
Thomas Boone Quaid is the younger son of Dennis Quaid, the veteran actor known for films such as The Right Stuff, The Parent Trap, The Rookie and The Day After Tomorrow. Unlike his father and his older half-brother, actor Jack Quaid, Thomas has not established a professional career in film or television.
Most of the dependable material about Thomas concerns his family, his childhood medical experience and, more recently, his education. That distinction matters because many celebrity biography pages attach occupations, estimated wealth or personal relationships to famous people’s children without credible sourcing.
Thomas spent most of his childhood away from continuous entertainment coverage. By 2026, however, several important milestones had become public: he turned 18 in November 2025, completed high school in June 2026 and moved on to university.
His Parents: Dennis Quaid and Kimberly Buffington
Thomas is one of two children Dennis Quaid shares with Kimberly Buffington. Dennis and Kimberly married in 2004 and later divorced, with their marriage formally ending in 2018.
Dennis already had an older son, Jack Quaid, from his marriage to actress Meg Ryan. That makes Jack Thomas’s paternal half-brother.
The siblings have followed noticeably different paths. Jack became a professional actor and gained major recognition through projects including The Hunger Games and the television series The Boys. Thomas and Zoe, by contrast, spent their school years with considerably less media exposure.
Thomas Boone Quaid and His Twin Sister, Zoe Grace
Thomas and Zoe Grace Quaid were born on the same day, November 8, 2007. They have frequently been discussed together because the most consequential event of their infancy affected both children.
Their paths began to separate more visibly after high school. Recent reporting states that Thomas went to the University of Colorado Boulder, while Zoe headed to the University of Virginia. Their father spoke in August 2026 about adjusting to both of his youngest children leaving home for college.
The 2007 Heparin Medication Error
The most extensively documented event from Thomas Boone Quaid’s childhood happened only days after his birth.
Thomas and Zoe developed staph infections and were admitted to Cedars-Sinai Medical Center in Los Angeles for treatment. During their hospitalization, the newborns were mistakenly given a highly concentrated form of heparin, an anticoagulant used in medical care.
Government testimony submitted by Dennis Quaid in 2008 stated that the twins received heparin with a concentration of 10,000 units rather than the 10-unit Hep-Lock preparation intended for their intravenous lines. In other words, the concentration administered was 1,000 times stronger than intended.
Cedars-Sinai described the incident as a preventable error. Contemporary reporting found that the wrong-concentration vials had reached the pediatric unit and that the twins received the high-concentration medication more than once.
Thomas and Zoe recovered. Later reporting on the family described both children as having made a full recovery from the episode.
How the Incident Became a Patient-Safety Issue
The episode extended beyond celebrity news because it became part of a wider discussion about medication labeling, hospital safeguards and preventable medical errors.
Dennis and Kimberly Quaid pursued legal action involving Baxter Healthcare, the manufacturer connected to the heparin products. An Illinois appellate court decision from 2009 records the parents’ claims on behalf of Thomas and Zoe and describes the November 2007 hospitalization and medication error.
Dennis Quaid also appeared before the U.S. House Committee on Oversight and Government Reform in May 2008. In his testimony, he described what happened to the twins while discussing pharmaceutical safety and patients’ ability to seek legal remedies.
The experience subsequently became closely associated with Quaid’s work promoting awareness of medical mistakes and patient safety.
Thomas Boone Quaid’s Education and 2026 Graduation
For much of Thomas’s school life, his education remained outside detailed media coverage. That changed when he completed high school in Los Angeles on June 3, 2026.
Dennis Quaid and Kimberly Buffington both attended their son’s graduation. Dennis’s current wife, Laura Savoie, also attended, and Dennis spoke during the graduation event.
The occasion marked a significant transition for Thomas because he was preparing to leave California for college.
Where Does Thomas Boone Quaid Go to College?
Thomas Boone Quaid is attending the University of Colorado Boulder.
In August 2026, Dennis Quaid told People about dropping his twins off at their respective colleges. The publication identified Thomas’s school as the University of Colorado Boulder and Zoe’s as the University of Virginia.
There is no dependable public confirmation of Thomas’s major or intended profession. Claims assigning him a specific field of study should therefore be treated cautiously unless Thomas, his family or the university confirms them publicly.
His college choice is particularly interesting because there is still no sign that Thomas has followed Dennis or Jack Quaid into professional acting. At 18, his public story is centered on education rather than an entertainment career.
Thomas Boone Quaid Timeline
| Year | Milestone |
|---|---|
| 2007 | Born in Santa Monica, California, with twin sister Zoe Grace |
| 2007 | Hospitalized with Zoe for staph infections and survived a serious heparin medication error |
| 2008 | The twins’ experience became part of Dennis Quaid’s congressional testimony on drug and patient safety |
| 2009 | Litigation involving the family and Baxter Healthcare appeared before an Illinois appellate court |
| 2025 | Thomas turned 18 on November 8 |
| 2026 | Graduated from high school in Los Angeles |
| 2026 | Began the next stage of his education at the University of Colorado Boulder |
Is Thomas Boone Quaid an Actor?
There is no established professional acting career for Thomas Boone Quaid as of September 2026.
The assumption is understandable because both his father and half-brother work in entertainment. Dennis Quaid has spent decades acting in film and television, while Jack Quaid developed an independent career that includes major film, television and voice-acting roles.
Thomas has taken a different route so far. His transition from high school to the University of Colorado Boulder suggests that education is currently the clearest publicly documented part of his adult life.
Frequently Asked Questions
How old is Thomas Boone Quaid?
Thomas Boone Quaid is 18 years old as of September 2026. He was born on November 8, 2007.
Who are Thomas Boone Quaid’s parents?
His parents are actor Dennis Quaid and Kimberly Buffington, Dennis Quaid’s former wife. Thomas and his twin sister were born through a gestational carrier and are Dennis and Kimberly’s biological children.
Does Thomas Boone Quaid have a twin?
Yes. His twin sister is Zoe Grace Quaid, who was born two minutes after Thomas on November 8, 2007.
Is Jack Quaid related to Thomas Boone Quaid?
Yes. Actor Jack Quaid is Thomas’s older paternal half-brother. Jack is Dennis Quaid’s son from his marriage to actress Meg Ryan.
What happened to Thomas Boone Quaid as a baby?
Thomas and Zoe were hospitalized with staph infections shortly after birth. During their treatment at Cedars-Sinai Medical Center, they were mistakenly given a heparin concentration 1,000 times stronger than intended. Both twins survived and recovered.
Where is Thomas Boone Quaid going to college?
Thomas is attending the University of Colorado Boulder. His father discussed taking him to college in August 2026.
Conclusion
Thomas Boone Quaid grew up connected to one of Hollywood’s best-known acting families without building a celebrity career of his own. Born in 2007 with twin sister Zoe Grace, he survived a serious medical error that later influenced his father’s patient-safety advocacy. His life entered a new stage in 2026 when he graduated from high school and headed to the University of Colorado Boulder. For now, Thomas’s documented path is one of education and early adulthood rather than acting, making speculation about his future career unnecessary.
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