Unfortunately, the other options are limited. They can put all the boys in foster care, but there are plenty of bad outcomes there, especially for adolescents. Also, the one who is 17 is about to age out of foster care, and then he’s legally on his own. There’s almost no possibility of adoption: the system is designed to put them back with their natural parents, regardless of how long they thrash around in limbo.
Realistically, the best likely outcome is that the state can make the parents get their act together sufficiently to give the younger boys a decent life for a while. The fact that they seem to have two parents together is something.