My cat had kittens and I think she abounded them. I have another cat that is pregnant. She hears them in the house, so she sits down by the door wanting in. I don't know if I could put in with them. I don't know is can nurse them.

Im not an expert on cats but if the other has milk than she if she wanted to but if the mom is still around than she may not allow the other cat to nurse her kittens. I would let her in and see what happens watch carefully and if things start getting to hot than take the other cat out of the room