In what ways does family cohension, with both the Curtis brothers and the greaser gang, become more important? What is threatening it?

The Greasers have an extended family. The Curtis family have taken characters like Johnny and Two-Bit under their wing. The Socks may have money but they do not have brotherhood. Dally is doing his best to be a food father figure but their family is always under threat of being broken up by Social Services if any of them break the law.