It was very common for one's family to be kayfabed. The Stomper situation is especially notable/colorful/etc because during a promo he specifically threatened to come to Hart House and piledrive Helen into the sidewalk. Bret ran and hid under a table, getting very confused when Helen greeted Stomper like he was her best friend.
As far as family stories, one of the most famous is from when Peter Maivia was wrestling in England. Jackie Pallo was getting heat on him, and Peter's wife, Lia, not yet smartened up, ran into the ring and beat the everloving hell out of Pallo, the top heel.
As far as Watts, he did end up firing Bob Orton Jr. after the latter got in a fight because there were no bruises on Orton's knuckles so it appeared that he didn't fight back and lost (though it seems like a strange story since Orton's had a super tough guy rep).
There's a similar type of story that would be a good fit: Rey Mendoza, who was a very tough guy, was known for going into bars and starting fights (which he always won) because word would spread about how tough the wrestlers were.
As far as Kevin Von Erich's collapse (which Gary Hart says was a seizure due post-concussion syndrome), Bruiser Brody gave him chest compressions and Tommy Rogers gave him mouth to mouth recessitation. Rogers has said that Fritz was angry at him for making Kevin look weak, but yes, generally speaking, that sort of conduct on Fritz's part was frowned upon.