Hi, I'm not a mum, I'm a daughter and I am sure that my mum is cheating on my dad, but I'm not sure how to tell him. I'm really struggling with this and I am so scared that I will hurt my dad and they will get divorced. I found messages a few months ago between my mum and the guy she's cheating on who I know, which is disgusting. And they are sending videos, and talking about you know what. I think they are meeting up as well. Please help I don't know what to do.