This reminds me of our two stray girls who turned up on our doorstep, both heavily pregnant. They gave birth about two days apart. We had a box in each bedroom closet, but they couldn't bear to be apart and kept visiting the other's box, nursing the babies at the same time. We finally found a huge box and put them together. They were so much happier,and the kittens were HUGE from going back and forth to the "mommies buffet".
Ha ha...awesome!