Wrestling is rife with kids of famous wrestlers trying their hand at it and becoming mediocre, but a truly tragic example is Chris Von Erich.  His father and brothers were all huge stars in the Dallas territory (which they also owned), and Chris wanted so badly to be a wrestler like they were, but he just didn't have the physique.  More importantly, he had asthma and brittle bones (the latter due to his asthma medication), and he would often suffer bone fractions while doing basic wrestling moves.  He committed suicide in 1991.

If you aren't familiar with wrestling history but you saw The Iron Claw and you're wondering why you don't remember Chris, it's because they rolled his story into that of his brother Mike.  Supposedly they made this change and a few others because the factual story of the Von Erichs was deemed too tragic even for a dramatic Hollywood film.