He lets the hen crawl under him in order to keep warm at night and so he had to sleep standing up, so I doubt he'd complain much regarding the much smaller things hiding under him.very pretty silkies. I wonder what he'll do after her eggs hatch. Some silkie roos will keep the chicks warm while mama takes a break for herself. That would be cute if he did it also.
He has shown no aggression towards the hen or any interest in the nest other than snoozing besides it and sticking close, not bothering the hen at all unless she is off the nest, and he charges at me occasionally when I am checking the hen in her nest and she grumps out about it, and he chases the scardy-cat, my cat Angel, out of the room, but doesn't jump at me. So I doubt he'd be aggressive towards the chicks since he is being defensive of the nest and his mate, but it is always best to be safe than sorry as even though Silkies, both hens and roos, have a good rep with chicks, the chickens are still individuals.