I've never hatched eggs before, and we're fairly new to chickens in general. A few weeks ago we went on vacation and had a friend checking on our chickens. He left the eggs in the coop so one of our hens started sitting on them. (We have 3 chickens-mama, her son the rooster and her daughter the other hen). Mama is on the eggs. Sister likes to lay her eggs in the spot mama is sitting. I keep telling my husband we need to mark the eggs or stop sister from laying there but he doesn't think it's a problem. Now mama is laying on 18 eggs (she's a buff orpington). Once the first chicks hatch, will mama continue to sit on the eggs of the non hatched or will she abandon them? Help!