Modern family pack

Think maybe was possibility of expanding on the family stuff beyond parenthood, in a world where nuclear family isn't necessarily how everyone live or grow up. So maybe would be nice with a pack now we got months and stuff with share custody where calendar is used to mark which days kids are with either their mother or their father, with some mechanics where they could show up either place on right days. As it would seem like something is more difficult to do for sim play currently, outside manually inviting sims to hang out which would mean they would leave again after couple of hours less you invite them to hangout again after set time, other only options I see doing this within current stuff without a pack would be using get together and do it like some sort of club event.

So think maybe it would be a nice idea for a pack maybe gameplay or stuff pack depending on depths put into, also good reason for updating family tree to have stuff like step parents, foster parents biological parents etc..?