What should I do?

I am in a weird place with my parents. They have done something really wrong to my husband and he is very upset. After a myriad of things they have done/said to him/about him and things they have said to me we both stopped talking to them early June. I just told my mom I wasn't talking to her right now and blocked her on things. My little sisters have been very upset about it but it's so much bigger than they can understand.

My mom reached out to me yesterday asking if she could at least she the babies (my two daughters) & said that even if I am mad at her, I don't need to cut off their relationship. Then my step dad said the same..I am not necessarily mad at him since he is a pretty understanding person & suffers from a lot of mental illnesses..my mom doesn't really have any excuses. I didn't cry when my mom messaged me back but did when my step dad did. Still I am upset because the "misunderstanding" we are having with them is really big & I would rather not go into details..but they are completely misguided & quiet honestly the whole situation makes 0 sense and is really confusing. So that makes me even more upset with them that they won't let it go/change their stance/say they are sorry about it so I cannot move on from it. It's not something I can just say I forget about it (even if I forgive them with God) because it's just added to the laundry list of things they have done before.

I don't feel comfortable letting my kids around them right now because I cannot see them right now. I am a very forgiving person & have always been the mediator/peace treaty maker in the family and I feel like I need them to do that instead of it just be me. I need some strength.

And need to lay down ground rules. Before I left they would laugh while my daughter's twerked & my little sisters would sing songs about sex and gentilalia or make moaning sounds all the time!! And would use harsh words towards my daighters, scare them, and be mean to them in a joking way but it would make my daughter's cry. Everytime we were there my oldest would be a basket case of tears constantly and cry on the phone to my dad's mom about it.

Women who have been in situations where you had problems with your parents or in laws..how did you go about letting the kids visit with them? What did you have to overcome?

My mom still let my grandma see us and I'm glad she did..even though she was horrible to my mother. I still had good memories but she was a pretty nasty person to everyone else. I'm glad she was at least good to me..so I keep thinking about that and maybe I should message them soon about it..idk