Depends on the mobsters. Some mobsters want their kids to have nothing to do with the Mafia, while others are happy when their kids marry into Mafia families. Having a mobster in-law gives you the benefit of having someone you can work with and trust. Of course it doesn't always work out (look at Sal Vitale).
"I die outside; I die in jail. It don't matter to me," -John Franzese
