I agree that it's OK, provided both are adults. If a girl gets pregnant at 15, and say delivers at 16, when the daughter is 18, the mom would be 34. I don't see anything wrong with that, as far as age differences go. But I also think it would be a sad situation that a mom and daughter resort to a physical fight to settle differences. Perhaps an agreed upon rules catfight for their respective husbands or boyfriends??