I've had hens raise their chicks among the others and all was fine. First,make sure they have a place they can get to away from the others and somewhere you can feed them where the others can't get to. In my experience,chickens always want what the others have. I took a length of wire that was big enough for the chicks to get through,but not adult chicks, made it into a circle and put it in a corner of the house. You can put food and water in the ring and the chicks can go in there to eat. You may have to put mom in there a few times so she can show them the food and water,but after awhile,they will learn where it is. Just drop her some food right outside the ring and make sure she has a source of water that won't drown the chicks.You also may want to raise your other waterers up,so they can't climb in and drown.