Thomas Boone Quaid is the son of American actor Dennis Quaid and Kimberly Buffington. He was born on November 8, 2007, alongside his twin sister, Zoe Grace Quaid, through a gestational carrier.
He also has an older half-brother, actor Jack Quaid, from Dennis Quaid’s previous marriage to Meg Ryan.
Thomas became publicly known after he and his twin sister experienced a serious medication error as newborns at Cedars-Sinai Medical Center in Los Angeles.
They were mistakenly given an extremely high dose of the blood thinner heparin. Both twins survived the incident, which later influenced their father’s advocacy for improved patient safety.
Unlike his father and half-brother, Thomas has largely stayed out of the entertainment industry and maintains a private life.
There is no well-established public record of a professional acting career. In 2026, People reported that Thomas had graduated from high school and was planning to attend the University of Colorado Boulder.
Because Thomas is a private individual, reliable public information about his personal life, career plans, relationships, and finances remains limited.
