The Good Doctor’s Will Yun Lee may pretend to be a doctor on TV, but in real life, he has more medical experience than most due to his 6-year-old son Cash‘s rare condition.

Cash, Lee’s son with wife Jennifer Birmingham Lee, suffered a stroke when he was just 3 years old that led to frequent trips to the hospital and consultations with doctors as they searched for a cause. The family had to quickly learn how to navigate the medical system after Cash was initially misdiagnosed.