Thomas Boone Quaid was born on November 8, 2007. Within weeks, a hospital medication error nearly took his life.
The incident made national headlines. That also led Dennis Quaid to become an advocate for patient safety. His efforts helped bring attention to the hospital's medication errors and encouraged safety improvements across the country.
Here's what happened and where Thomas Boone Quaid is today.
Who Is Thomas Boone Quaid?
He was born on November 8, 2007, at 8:26 a.m., weighing 6 pounds and 12 ounces. His twin sister, Zoe Grace Quaid, followed two minutes later, weighing 5 pounds and 9 ounces.
The twins were born through gestational surrogacy, a path Dennis and Kimberly chose after facing several miscarriages.
As of 2026, Thomas is 18 years old. He graduated from high school in May 2026. Dennis Quaid filed a petition to end his child support payments to Kimberly Buffington.
According to court documents, he had been paying nearly $14,000 per month. He argued that the payments should end because the twins had graduated from high school.
What Happened to Thomas Boone Quaid at Cedars-Sinai?
Thomas Boone and Zoe Grace were given 1,000 times the normal concentration of heparin, a blood thinner used to prevent clots, at Cedars-Sinai Medical Center in Los Angeles, on November 19, 2007, and at that time they were approximately ten days old.
The sequence of events began with a routine medical need. The twins were supposed to be administered heparin, a mild anticoagulant, for a staph infection that both babies developed shortly after birth. This required nursing staff to set up an IV and administer antibiotics along with the heparin lock to prevent blood clotting. What followed was a chain of errors.
The Quaids got to know that nurses had accidentally given their children two powerful doses of heparin. They were supposed to get 10 units of heparin, and they got 10,000 units, twice. That's when their blood turned to the consistency of water.
The next 41 hours were critical. Dennis Quaid said he and Kimberly were shocked, angry, and confused as they waited to know whether their twins would survive…
And fortunately, both Thomas and Zoe survived.
They recovered after being treated with a drug that reverses heparin's effects.
A state investigation found that Cedars-Sinai had failed to follow the SOPs when administering medication, and that the pharmacy technicians and nurses failed to check product labels before dispensing heparin or to keep thorough records of when the drug was administered.
The California Department of Public Health later cited Cedars-Sinai Medical Center, along with 10 other hospitals, for violations that caused or were likely to cause serious injury or death to patients. The hospital was fined $25,000.
Why Did the Error Happen?
The root cause was a packaging problem that had already killed children elsewhere. The overdose happened because two medications, heparin and HepLock, came in similar-looking vials from Baxter Healthcare. Although the company had warned hospitals about the risk of confusion, the packaging remained unchanged.
The same mistake had occurred the year before at a Methodist Hospital in Indianapolis, where six newborns received a heparin overdose, and three died. By the time the Quaid twins were affected, the danger was already known.
Cedars-Sinai publicly accepted responsibility for the incident. Chief Medical Officer Michael Langberg described it as a "preventable error" caused by a failure to follow hospital procedures.
What Changed Because Thomas and Zoe Survived?
This is where the story of Thomas Boone Quaid becomes more than a biography of a celebrity's child.
In 2008, they founded the Quaid Foundation to help protect other families from preventable medical errors.
This foundation aims to change the medication system in hospitals, promote and advance a bedside barcode medication scanning system that matches the wristband of the patient and shows the list of medications they are supposed to take.
If the wrong drug or the wrong patient is scanned, the system warns the healthcare professionals before an incident happens.
Moreover, Dennis Quaid brought the issue to another level. Besides bringing up the problem based on what had happened to his children, he appeared before Congress and cooperated with experts from the healthcare field to find solutions.
The Quaid Foundation decided to collaborate with Texas Medical Institute of Technology (TMIT). TMIT is concerned with patient safety issues. Together, the two organizations made a documentary titled Chasing Zero: Winning the War on Healthcare Harm, and distributed it among all hospitals in the USA.
Additionally, Cedars-Sinai Medical Center decided to introduce over $100 million in safety innovations, including barcode medication systems intended to reduce human error.
Thomas Boone Quaid was only ten days old when he received the wrong dose of medicine. However, his recovery played a key role in raising awareness and finding solutions to the existing problems.
Thomas Boone Quaid's Life Today
Now 18, Thomas lives a life that his parents have worked deliberately to keep private. Both Dennis and Kimberly made a conscious choice to protect their twins from the pressures of fame. They have limited their children's exposure to social media and public events, allowing them to enjoy a normal childhood filled with school, hobbies, and family life.
His interests reportedly span music, particularly guitar playing, and sports, suggesting a well-rounded upbringing. Whether Thomas will pursue entertainment like his half-brother Jack, or build a path entirely separate from Hollywood, remains to be seen. At 18, he is at the point in life where that question begins to answer itself.
His parents divorced in 2016, after twelve years of marriage. Both Dennis and Kimberly have remained committed to co-parenting Thomas and Zoe with stability.
The twins were raised with conscious effort to give them normalcy, something genuinely rare for children who made national news before they were three weeks old.
Frequently Asked Questions
1: How old is Thomas Boone Quaid in 2026?
Thomas Boone Quaid was born on November 8, 2007, making him 18 years old as of 2026. He graduated from high school in 2025 or early 2026. His twin sister is Zoe Grace Quaid, born two minutes after him on the same date.
2: What happened to Thomas Boone Quaid as a baby?
After eleven days of his birth, Thomas and his twin sister Zoe were accidentally given 10,000 units of heparin at Cedars-Sinai Medical Center in Los Angeles, which is 1,000 times the 10-unit dose appropriate for newborns, according to ABC News. Both infants nearly died but recovered after treatment with a heparin-reversing drug. The incident triggered a state investigation, a $25,000 fine against Cedars-Sinai, and a patient safety advocacy campaign led by their father, Dennis Quaid.
3: Who are Thomas Boone Quaid's parents?
His father is Dennis Quaid, an actor with a four-decade Hollywood career. His mother is Kimberly Buffington, a Texas-based real estate professional. Dennis and Kimberly married in 2004, and their divorce was finalised in 2018. Both share custody of Thomas and Zoe.
4: Does Thomas Boone Quaid have siblings?
He has a twin sister, Zoe Grace Quaid, and an older half-brother, Jack Quaid, born in 1992 to Dennis Quaid and actress Meg Ryan, who is an established actor known for The Boys and The Hunger Games franchise.
5: Is Thomas Boone Quaid on social media?
No verified public social media accounts are confirmed for Thomas Boone Quaid. His parents made a consistent and documented choice to keep both twins away from public-facing platforms and media attention throughout their childhood.
6: What was the Quaid Foundation?
The Quaid Foundation was established by Dennis and Kimberly Quaid in early 2008, following the heparin overdose at Cedars-Sinai. It advocated for bedside bar-coding, clearer drug labelling, and safer hospital medication protocols. In 2010, it merged with the Texas Medical Institute of Technology (TMIT), and together they produced the documentary Chasing Zero, distributed free to over 5,700 hospitals across the United States.
