Karen, I have the same problem. It's like having 3 flocks. I have the 6 big girls, the 4 medium girls and the 4 babies (3 girls, 1 roo). The babies actually intermingle with the big girls more than the medium girls, but I think that may be because the roo is with them. The medium girls rarely come out of the coop and the babies stay in a different part of the run than the big girls. And you're right. Once in a while all of them get together and there's chaos!
When I let the big and medium girls out to free range, they go to different parts of the yard. At night the big girls roost, the medium girls sleep in a nest box and the babies sleep in a corner. Oh well.
And in case anyone is counting, that adds up to 8. 
A+ in chicken math: 1 BS + 1 BR + 1 BA + 1 GC + 2 EE + 1 BO +1 SLW + 1 SS + 1 LO + 1 GLW + 1 BCM + 1 AW + 1 BCF = 8. I am married to The King of Coops and I have a firefighter daughter who's my hero. We also have a spoiled designer dog (a/k/a expensive mutt), a deaf calico cat and Brutus, the wonder cat.
A+ in chicken math: 1 BS + 1 BR + 1 BA + 1 GC + 2 EE + 1 BO +1 SLW + 1 SS + 1 LO + 1 GLW + 1 BCM + 1 AW + 1 BCF = 8. I am married to The King of Coops and I have a firefighter daughter who's my hero. We also have a spoiled designer dog (a/k/a expensive mutt), a deaf calico cat and Brutus, the wonder cat.

















Oh, and he had major rotator cuff surgery that was not arthroscopic....so we've been through that too. Hope you feel better really soon.
