I've heard this is normal when Queens share the nursing duties . . . watched a special on TV all about colony cat behavior, and the females within a colony had a special nursery set up in a barn whereby they could keep all the kittens together and take periodic turns caring for them . . . like a human day care center!

If any males tried to intrude, the females ferociously chased them away. Unfortunately, a Tom did sllp in when no female was watching and killed many of the kittens . . . very sad . . . . . . but again, normal feline behavior according to the show . . . wish I could recall what channel and the name of it.

Sounds like you are having much fun with all the kittens, and so glad to hear they will all have good homes!