When my wife and I were first married, my father-in-law told me I could call him Dad. I really liked him and he was a great f-i-l but I could just never bring myself to call him Dad.
Paul Newman quote: "“I don’t like to discuss my marriage, but I will tell you something which may sound corny but which happens to be true. I have steak at home. Why should I go out for hamburger?”
Stranger danger!