Okay so say my dads name is Bill and our family female friend is Sally.

One night at 1:20 A.M. Sally comes over. It’s not the first time this had happened. Well Sally goes into Bills room and they start talking. After a few moments they are kissing and then the start having sex. Well Sally is married and I know her husband pretty well. Do I tell him?? I don’t even know what to do. Because I know she is cheating on him and I don’t feel that is right but I don’t know. Some one help me out?!?!