Broody grey andulision
Don't separate momma from her chicks - she will decide when she's had enough of them. If they hatch in the main coop, the little ones should be fine with the protection of mum, but you may need a separate area so they can access starter feed and water. I have used a small crate in the past to serve as their "feeding / sleeping quarters" (kept in the main coop) which i leave open during the day so mum can take her chicks out and about. We all do things differently and according to our circumstances.