At the beginning of the summer my hen hatched 9 of her own babies and some predator ate/chased away all but one (they were about 2 weeks old) survived but she didn't want anything to do with the lone chick, she wanted the cage of chicks (7 days old from an incubator at the elementary school)The mother bird sat on top of their cage cooing and squawking. So I put her baby in with the younger ones, it wasn't doing well without the mother, and put mom in the cage. Aside from attacking me, and the school chicks freaking out...they all learned to love each other.
I have tried other times and the bird attacks the chicks.
I have never tried at night...I figure then you'll wake everyone up and you'll be attacked in the dark..ouch....but maybe it's better lol...
Good luck..let us know
Dawn