Mature only! 18+ (abuse/healing)

Melody

Its been 10 years since my father started sexually assaulting me. Five years since he stopped. I'm an adult now with a husband and our own home, but I can't help feeling that it is unresolved. I was forced to be around him every week sometimes several times a week and shove down all my feelings. My sister had him do worse to her back then. It really started back up when she started to see red flags when he would insist on giving her 4 year old daughter a bath alone (my sister and her kids stayed with my parents for like 3 days a few weeks ago.)

My sister confronted me last weekend and asked what happened to me. We shared our stories and are trying to heal from it. Niether of us were allowed to properly heal. We confronted our older sister who says it never happened to her, but doesn't know what we should do other than inform our mother who has been married to our father for 30 years. We are worried our mother won't believe us, or that she will think we made it up to make her leave him. My father has long term terminal cancer and has treated her like crap the last 3 or 4 years. Unsure what to do. I know that I don't feel the need to confront him. He knows what he did and he has to live with that, and I'm okay with that being enough as well as not having anything to do with him for the rest of his life. Any suggestions or thoughts? I think I really needed to vent it all out.