Groups

It is obvious that Collogero belongs in his community. As a child his groupings were as small as his family, and a few friends. When he grew older his groups expanded, and I would consider his main ones to be with Sonny, his italian friends, his crush, and his family.
Although one of his groups is with Sonny, I wouldn't necessarily put him with Sonny's main crew. Collogero and Sonny have a close relationship, but its limited to a father-son type relationship, because for the most part Collogero doesn't participate in the illegal activities that Sonny does.
I would definatly put Collogero and Sonny in their own groups, because again, although they are very close, their lives are very different in terms of who they associate themsleves with. Sonny's master status is obviously with his crew.
Collogero's master status would probablly be with his Italian friends throughout the movie, because he did everything with them, and he disregarded Sonny when he told Collogero to stay away from them. Durring the final parts of the film, where he finds his friends dead, his master status changes. He then associates himself more with Sonny, the main person in his life, because Sonny saved him from an almost certain death.