I think my Dads cheating 😔

I think my Dads cheating on my mom. They have been married 34yrs. He's leaving for work 3hrs early. I've over heard phone conversations he was having about sending Dirty pictures and shaving his face so he's all smooth for "you" in the morning. I don't know what to do. I'm so broken about it. I live with my parents and have my 3children living here as well. My parents asked me to stay with them. So if I tell my mom I risk getting kicked out by my Dad. What do I do? Do I just mind my business? Do I risk myself and my kids being homeless? I have no way of getting my own place.Â