When my what are now sixteen-week-old Orpingtons were about eight weeks old, I bought a rooster and two hens silkies. I gave away the rooster and one of the hens. The new hen went straight in with the Orps with no problem: however, socially, she didn't seem to fit it, e.g., she can't get up on the roost with them, and she's not like them in many ways. She hatched a single week old chick last week to keep her company, and she's as happy as a lark. I sure hope the chick turns out to be a hen because if it's a rooster, I won't keep it. If it's a female chick, it's mother and it will be much happier having each other together when they join the three hens and one rooster Orpingtons.