My Father in law is a nice man, but every once in a while he gives me a subtle threat. If I ever hurt his daughter, I would regret it. We've been married for 10 yrs! I've told my wife. She say, He's just kidding around. But it doesn't feel like a joke. What should I do next? I don't want to live in fear for the remainder of my life or marriage, whichever comes first!