My wife let me know recently that her dad paid off the mortgage on his recently paid house. Sounds great, but he wants to keep this info from his girlfriend who lives with him. Apparently she pays him $500 a month to live there too. Sounds pretty deceitful to me. I asked my wife why he is keeping this from her, but she said she doesn't want to talk about it and wishes she didn't tell me. This situation doesn't involve me, but I've seen him act similarly about money matters in the past. My wife doesn't seem to think anything is wrong with it. I think she's just giving her dad a pass.