Try to remain on your brother and his wife's good side for the kids' sake.
If he removed him from healthcare benefits, then call him and tell him that to add him to your health benefits, you will need to have legal guardianship, and you want him to go to school. If he can't meed you on these two points, then I think calling children services is the thing to do.
I'm sorry. it's a terrible place to be in, and then there's the younger child too. It sucks that they are separated, when they are the closest relatives they have.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC