well, i have some experience in introducing baby boys to older males and it's not good. I put a 3 week old baby boy in with his father and after the boy matured at about 4 months old, he went for dominance and nearly killed his father. the same thing happened twice more when i introduced baby boys to older males for friendship. after 4 months the younger one attacked the older one every time.
there were 7 in both my litters btw.