Me and my mom's relationship is ruined forever after this

I thought me and my dad's relationship was ruined after I walked in on him having his hands down my 13 year old sons pants... But me and my mom's is definitely ruined forever. She started a go fund me to bail my dad out and LIED about why he was in jail. And now she is on Facebook posting about how we and dad are renewing their vows.. I have never been so pissed! My ex has been staying here because after he found out what happened he flew himself out to help out to be there. Our son thought he was going to be ashamed of him especially since he's wearing drynites because my dad caused him to have sleeping accidents but my ex put his military vet personality aside to comfort him. He needs both of us. It's hard to explain to my 4 year old why grandpa isn't around anymore and she misses him. My daughter has already been talked to. She wasn't touched. Plus she shares a room with me so dad was never around her alone. My dad molested my son and I found out he molested and raped my brother which is why he never comes home. My mom is out hear planning a wedding while my son is having break downs because detectives keep asking him the same questions. He's scared to sleep on his own and will run to sleep in the bed with me or on the air mattress with his dad. He is now in therapy and going through so much but she's bragging about renewing her fucking vows. She knew my brother was being sexually abused but turned a blind eye. Idc if people say she's still my mom. When she dies I hope she Rest In Hell along with my father!