Mielr said:
I always forget he's David McCallum's son and Michael York's step-son. Wierd.
Where did you get that from?
According to IMDB, David McCallum "has a daughter, Sophie, and son, Peter, from his marriage to Katherine Carpenter. Jill Ireland and he had three children, Paul McCallum, Valentine McCallum, and an adopted son, Jason, who died on 7th November 1989 from an accidental drug overdose."