Hi and welcome to BYC from northern Michigan
You may find that both hens will leave the nest when some of the chicks hatch, so if they started sitting together and the eggs hatch out together you may be fine. As far as leaving the chicks in with the other birds, I think that depends on the other hens - some can be bad with little chicks. You may want to try to pen off a corner for your moms and chicks, that way they will still be in the coop but the chicks will be safe.
You may find that both hens will leave the nest when some of the chicks hatch, so if they started sitting together and the eggs hatch out together you may be fine. As far as leaving the chicks in with the other birds, I think that depends on the other hens - some can be bad with little chicks. You may want to try to pen off a corner for your moms and chicks, that way they will still be in the coop but the chicks will be safe.