Shouldn't this be in the mods forum?

If "supporting your family" is realistic, then so is "your family supporting YOU". All the threads on this topic (and yes there are a few) seem to assume that a) the player is male, and

the male is the breadwinner. And the rest of the family are pretty much domestic slaves.
I would say that a realistic family would represent a variety of models of family relations, including one where your spouse has a successful career and gives YOU stuff, and one where your kids are no-good rascals who run off and join the thieves guild, and so on

Would be amazing, but I think the growing up part is impossible to implament...
Secondly, the scripting would be so hard to do! By scripting I don't mean lines/quotes/speech etc.
Impossible to implement? Why? There are dozens of games that do something like this. GRADUAL aging would be hard, yes... and very few if any games do THAT... but age stages like infant/toddler/child/teen is no problem.
Time is a real issue, it's true... to pull it off you'd really have to play fast and loose with the game clock, which is what other games that implement this sort of thing do.
As for the scripting being hard to do, there have been plenty of mods that do much harder things for the earlier games in this series
