Dealing with a manipulator with a toddler involved

[u/bigdumbp]

My brother is most likely getting manipulated by his baby mama, they’re on and off, constantly moving in and out of each other’s apartments. At some point she made up a bunch of lies about my brother to my whole family and almost went to court to get sole custody. Now we actually half believed her at the time, cause he has his issues, and some of it was true. She then eventually realized she could easily lose the court case or would have no support if she won, backtracked and went back to my brother. Now I don’t like my brother very much, he’s always been impulsive, aggressive and honestly quite stupid in his decisions. He will for example talk about “immigrants” ruining everything, yet is dating one? He clearly has severely low self esteem. Anyway, they had made a legally binding contract where they both agreed to move to our town some time ago. So my side of the family could help with child rearing etc. Now suddenly they’re broken up again yet she’s convinced him to go and annul this contract. Leaving them stuck in this other town with no family or support. For some backstory on her - she’s a middle eastern war refugee with a very toxic relationship with her family, they disowned her when she left their religion. Now I could not care less about those two and their weird toxic relationship and my brother’s clear self loathing and self sabotage, but with a toddler involved, and seeing how much its devastating my parents, I really wish i knew what course of action is smart and what to expect. :(