Question: This motorcycle racer with over 100 race wins was the son of a motorcycle racer who died after what?
Sentence (from "William Dunlop (motorcycle racer)"): William Dunlop (born 23 July 1985) is a Northern Irish motorcycle racer, brother of Isle of Man TT winner Michael, the son of the late Robert, and the nephew of legendary TT racer Joey Dunlop.
Relevant evidence: Yes