When my only hen went broody and the rooster was wandering around the house and sulking in the hall way at night, I decided to introduce him to the chicks inside. Usually he only encounters them when outside during the day and often chased and pecked them, one time even picking one up and trying to run off with the baby.
I brought the sulking roo into the living room where we were keeping the chicks, who were about 2 month old, and sat down with him on my lap and them all on the couch... Lets just say, the chicks were more aggressive than the rooster at first, pecking at his comb and wattles until I poked them to tell them to stop. After that, they snuggled and after a while when I needed to sleep, I put the roo back in the kitchen where he resides, and in the morning when he and the chicks were let out, he was completely fine with them and were treating them as his flock.
Now the chicks live with their dad and follow him around everywhere when I am not around.

Hen is still a grump towards them, but the rooster stays out of the scuffles between her and the little ones now and the chicks are a lot faster than the hen and can avoid her when she is off the nest, so I am not too worried. The main issue was when the crazy buggers kept poking their heads in the nest box being nosy and getting a good peck on the head! Took about 10 times being pecked for them to stop doing that.