Any particular reason you want to put the sire with the offspring? The dad rabbit probably doesn't really care about any of 'his' offspring, he's probably not gonna even figure out that they're his. At this point, mom rabbit is gonna be weaning them and won't really want to have much to do with them, either.
Rabbits seem to have more of a social type of a group than a family type of group. Even then, they're a pretty distanced social type of group. They seem to like their own space if they can get it. But, this is just in general, as individuals, they can do surprising things.