The Osprey Twins

Passed by the nest site again this evening and heard one of the ospreys making a hang of a racket. Stopped and looked, could see one parked on an old branch preening itself. Then we realised there was one still tucked down in the nest, must have been the noisy one. We sat and wat he'd for a while but neither bird seemed bothered about moving.
Just wonder what all that fuss was about!