Should I tell my friend that her father made a ual advance at me? ?

There are pros and cons to this case. You have to evaluate and give weight to each side and determine which is heavier. If you tell your friend about it, there is a possibility she will not believe you. In fact, it may backfire on you later when the father will allege on something like, you provoked him or you have given him some leads. How well do you know your friend lies your answer to your question. Nothing happened anyway so I suggest you just keep quiet about it to protect a relationship. However, should this thing happened again, you should try to slap him on the face at the first instance and tell your friend that you'll never be with her family again.