My friend has chickens. She also has baby chicks....hatched from many eggs from different hens.
I learned something about hens today. A mother hen doesn't care if the eggs are hers or not. If she is ready to brood and there are eggs needing incubating, she sits on all the eggs. The broody hen takes care of all the eggs.
I have three girls: two adopted from China, one in the foster care system. They are my children. I love them. I will take care of them. It doesn't matter if I gave birth to them or not. Just as the broody hen loves and cares for the eggs of other hens, I do the same. Many of the baby chicks look nothing like the broody hen. My children bear no physical resemblance to me. It doesn't matter. They are mine. I love them and I will care for them.