LONG POST CUSTODY QUESTION HELP!!!

Hello Fellow Mommies,

So my ex and I recently broke up we have a son together. We were together for 9 years and then he cheated on me with his other baby mother. Which he has three children with. Me and his other baby mother never got a long and always have hated each other. He still tries to mess around with me and then I know he goes and messes around with her as well. To get to the point his other baby mother told me whenever I’m around or with him that he cannot see his other children or bring them around me. I also told him the same thing that she is not allowed near our son. But which I have reasons to. She has tons of dyfus cases, I have pictures of her old house and the insides from the landlord. With shit smeared on the walls, bathtub, filthy toilets, roaches you name it the house was awful looking an not safe. Her husband which she isn’t in a relationship but still legally joint filing for divorce are living together and he is a heroin addict or past heroin addict. She also has tons of dyfus reports of neglect and abuse. She also has filed allegations against me before out of jealousy saying I’ve hurt her children but the cases were found untrue and denied. She also has a court case coming up we’re it’s her vs dyfus saying that she is and unfit mother and if dyfus needs to step in and take her children. To get to the point she is sneaky and is trying to work ways were she’s asking our baby dad to take my son and bring him around to see the other children. Do you think with all this proof and such that I could get it court ordered she is not allowed to be near my son because she is a threat of danger and harm. I do not trust her at all. Thank you!!! No rude or means comments please. I do want the siblings to see each other and have a relationship but just not with her around!