I'm scared for my brother

My brother is not doing well at all. He's going through a divorce and has five kids to take care of, one of them being a newborn. His wife ran off with the guy she had been cheating on him with. Leaving behind her kids. That baby is barely 8 weeks old. His kids are 13 8 4 2 and 8 weeks. He seems to be falling apart. I think he should go get child support from her but I'm not sure how that works with mothers. He's called me crying over the phone. He's stressed and is having trouble keeping up with bills and trying to figure out child care. I live in our mom's old house. She left it to both of us but he gave it to me because he said I needed it. I'm honest considering asking him to move in. I have the space and don't mind. Idk what that would do to his pride though. Nothing seems to be getting better. He's worried his cancer is back for the third time, but hasn't had time to go to the doctor because hes so busy with his kids. He told mh last night if something were to happen to him he asked if I could take the kids. I said yes but now I'm worried he's gonna kill himself and thats what he meant.