HOW eggsciting! I didn't get to observe that stage of my Buffy's hatch. In the morning when I felt for the eggs, I *thought* I felt one move, but put it down to my imagination. But at 6 PM, there was the GrandChick!
(I saved the eggshell from which it hatched. Pretty silly, huh?)
I was terribly afraid she'd kill the chick. She was segregated in the A-Frame coop, and while she got a visitor or two at various times during the day(s) before the egg hatched, I locked that coop up for the first 3 days, just checking the upstairs through the side hatch. On day 4 post-hatch, I started opening it up again. She didn't bring GrandChick out of the coop until it was 9 days old. She's now moved downstairs, no longer sitting in the nestbox upstairs. I think that's due to the long ramp she has to talk the chick up and down...... She has not returned to the Big Coop where she roosted before she got broody. She's taking very good care of our chick *ahem* down there, taking it outside for a couple of hours a day. She puffs up around the other ladies, when they get close, but none of them have acted aggressively towards the chick. Whew!
So we gotta see what transpires with your GrandChicks!