for me coaching my son has been great for the both of us, it has really been fun. for me this year he is 6 and will be my last year coching him i will leave the rest of his wrestling years to some one way better qualified than my self.
i was never one to get upset if he lost, as long as he showed respect for himself, the ref, the kid that beat him and there coaches.
one thing that will make me a better father coach this year is all the advice all of you offer on this site, i mean you guys have great advice on every thing from, nutrition, to how to handle a problem, just like when i needed advice on why little nix cried even when he was not hurt.
so yes i think a father and son can be good in the coaching aspect, but with the wrong father coaching i can see it being a disaster for the wrestler.