Just found out the girl (21f) I actually (24m) thought my dad (59m) was having an affair with is certainly his child

I am sorry in advance if this is all over the place. It' s been a roller-coaster ride of the week and I' meters still processing all this clips.

I finally ' caught' him after subsequent his car and he opened up. I actually don' t understand if it would' ve already been better if he actually was cheating on mum along with someone less than half his age or this. Apparently he or she told mum when he or she knocked up her mom and they agreed together that he would have no relationship with her and wouldn' to even be on the delivery certificate. Basically paid her mother off with 1 large lump sum. She reached find him three years ago and now they' re having a secret relationship. All his fishing trips were hoke. Some of his work excursions. Hell he' s even paying for her fucking tuition when I had to work the ass off to get a scholarship and still work to repay what was left. But that' s besides the point.

The point is I don' to know what to do with this information. In fact I do know but I don' t know how. I' mirielle not willing to keep secrets for dad. They begged myself to keep it between us but fuck them. I won' t be an accomplice to his thing with his daughter but mum will be crushed. She' s one of those mums who like to respond tough but finding out he' s been sneaking close to and using our money on, excuse my frankness however his bastard will rip her down. Especially given that they had an agreement. I don' t know how to even start that conversation. I' ve tried strong arming dad to tell mum but this individual knows that it because I' m struggling to do it personally and called my bluff. I' ve thought of informing my aunt to her yet I think that would also be as well uncomfortable for me because she' ll still know I had been the one who found out. Exactly what should I do?