Basically I found out today. This happened about two years ago, should I tell my mum or confront him first. I have had it confirmed by my brother who moved away because my dad and him fell out I now no this is the reason all I want to do is break his face but I do not know how my mum will take it. To cover his tracks he and my mum moved house and she is oblivious to it I also have two other brothers who do not have a clue I know it would cause a massive rift in the family what should I do.