>>18994896Chris Chan was born in 1982. His father was born in 1927, and his mother was born in 1941, making them 55 and 41 at the time of his birth respectively.
Older parents are far more likely to give birth to children with chromosomal defects. For instance, a woman who gives birth at age 45 has a 1 in ~30 chance of birthing a child with down syndrome compared to a 1 in ~1300 chance for a woman in her 20s.
Chris Chan probably had a chromosomal disorder.