It looks like my broody hen has stopped mothering the chicks after 4 weeks. One night she went to roost with the rest of the flock, leaving the babies alone and confused in their nest box so I took her down and put her in the box when it got dark. She reluctantly stayed with the chicks that night but would not stay with them no matter what on the next night. There was quite a lot of crying from the chicks and they ticked off the whole flock by jumping up to the roost and trying to get under everybody as they made their way down the bar to get to mom. She could only hold one chick under each wing so I took all the chicks and moved them down to the other end of the roost bar which, during the older birds' settling-of-the-pecking-order, became the low-status end of the bar. Everybody settled down and learned their place. Last night everybody went to their place with no crying or 'chicken politics.' Simply amazing.