How to handle as adult children when a parent cheats.

I’ll try to make this short without doing a full essay on my families history but, long story short I have a toxic family. Each sibling developed their own toxic traits from learned behavior of my parents. By all means I am not making excuses but we are now learning how to unlearn all that and struggling to figure out what is right and creating our own cycle breaking path. That being said, my dad cheated, abused (my mom) and has many other toxic ways of thinking and behaviors. We all moved back in with our parents (my brother and I) to try and get a bit more financial stability to buy a house or for other reasons. We didn’t realize how dysfunctional our family was until we came back and that’s when it got worse because we are adult children and have realized and learned from our own partners what is right and wrong. So after many months of arguing and stress it was causing my parents they resorted to kicking us out. For my brother it is his second time they do this but for me my first (it’s they’re house fine whatever) but then they try and brush it off and sweep it under the rug and pretend we’re a happy family.. they don’t realize the hurt damage and trauma they have caused us.. they are over critical parents with high levels of stress and no emotional intelligence it is horrible. My older brother decided enough was enough and has stopped speaking to my dad three weeks before he has moved out and my dad is clueless as to why. And it’s hard to make them understand why it’s wrong or bad when they’re stuck in that old generational thinking making excuses like we’re to old to change , or this is all we’ve known. Many times we expressed our concerns but they just don’t get it and it goes in circles in the end saying this is how we are. My dad is weak. Saying he’d rather kill himself then go to therapy. It’s so sad and pathetic but I know he has a lot of his own undelt trauma but it isn’t an excuse.. it’s heartbreaking and frustrating for us all.. anyways so my brother just confronted my mom saying he knows everything and she said it doesn’t matter he’s your dad. And that’s what she says every time it’s so sad. Even if she decides to stay whatever our resentment is with our dad.. never apologizes for anything. Avoids talking about feels and emotions it has honestly been hell for me too living here and I too soon will be leaving in a month or so.. I still love my parents but when shit hits the fan with my dad that resentment comes out. I guess I’m used to brushing shit under the rug with my “immediate family” (not the family I have with my husband). I love my parents they still sacrificed alot for us financially, busting they’re asses supporting us even still but they don’t get that that’s not everything but they make it seem like so.. saying things like (but you never went without).

How can I try and fix this if there’s any way? We’re all so fucked up.. I am the first of my family to start therapy and my dad called me a psycho and made jokes about me. We didn’t talk for 1 month and living in the same house was awkward. Us as adult children aren’t saints either tho but we’re trying.. right now me and my parents are talking and I feel sad my dad doesn’t know why my older brother isn’t talking to him but we’ve tried discussions and it never works.. my brother moves out tomorrow he is the oldest and he isn’t my dads but he raised him as his own since he was 1. That isn’t an excuse just information. He’s a bit different personality wise from the other 3 siblings. But he still got trauma and adult responsibilities pushed on to him when he was younger. Which gave him authority over us siblings like spanking and etc.. so we all have a tough relationship with each other.. and I’m trying to build relationships with each of my brothers because we all grew up fighting. It’s just messy and hard and idk where to start I want my parents to listen and realize even though they didn’t know better then they can make a change now.