i have had a 3- some kind of co-parent. a speckled Sussex and 2 little Bantam's. Apparently the little ones are very likely to go broody.
last year the 3 were in a laying box together. There wasn't any room but they managed. i saw them all on the eggs and would just laugh when I went in. i should have taken them out of the box because it was up 2 feet in the air but it never occurred to me what could happen. i walked in one morning and there were the 2 Bantam's on the floor of the coop. One had her wing over the other and i thought the one underneath was dead. i was heartbroken. Bantam's are my favorite as they each seem to have their own personalities and like us people. The one underneath has feathers on her feet and my children named her Runaway because she looks so funny running with all those feathers.
I went over to pick up the dead chicken and to my surprise a little chick poked its head out from under the chickens. I am imagining the chick fell out of the box on to the floor and these 2 decided to care for the chick. At this point I put them all in a dog crate with shavings and fed and watered them there for a week or 2. I forget which one, but one did take the dominant role although both would call the chick when there was food. When they were out foraging both mothers would call the chick and he would come running. At night the 3 would end up in a clump with the chick being on the bottom. Again the chicken on top would spread her wing over both the chick and the other bantam female. As the chick became larger they would sit up on the roost and try to cover him with their wings to keep him warm at night.He was a regular size chicken so out grew them rather fast .How my children knew he was a male i don't know. He was and is male and is now co-leading the chickens with my other one eyed rooster. Both these roosters are amazing with my children and the hens. they both call when they find food for the hens and never have ever attacked me or my children.
( although I had a bantam rooster who I had to give away because he attacked me and the kids....funny how he was fine where i sent him. He never attacked anyone there so they kept him alive because he was exquisitely beautiful)
The Speckled Sussex did hatch a few chicks from eggs and parented them alone as the Bantams were totally occupied with their own little chick.
Kristin