Rats are intelligent & social animals...& while some don't get along, since these obviously do I'd leave them together...most do what these are doing & cooperate
with raising the babies. Rats get lonely by themselves (though not so much when they have a litter, lol...). And they rarely kill or eat their babies...that's much
more common in mice. FYI, when I used to breed rats, I kept them in family "trios", one male & 2 females. The males are fine with raising the family too, normally, though they don't give the mom's any rest at all: they jump them as soon as they give birth, so they're nursing one litter while pregnant with the next.
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