I guess it depends on how you want to deal with the situation. If you get your father off, he is likely to want to try and get back with one or both of the communes, this could lead to a blazing argument, but it could just as easily not, if both women reject him absolutely for cheating on them without mentioning you taking his place. Of course he might just wander off and find himself another (third?) family.
Ultimately he did do the crime, so it up to you to decide if you think he should be punished for it for not, however if you are pursuing the bank manager, then you too are guilty of the same crimes, and could well face your comeuppance in the fullness of time.
There is no right answer, even if the outcome were known. Choose your poison really...