I was a bit confused on what you're talking about at first since I tend to play 1 house hold. But this would make the game a lot better.
Like I would love it to have the parents have kids, move out the kids when they are old enough, then follow the kids. Then when the parents do die, they will transfer their stuff to the kid I followed.
What should happen is sims should be able to call up or go on the computer and tell a lawyer where they want their stuff to go. This includes family, friends, donation, or no where/gov. I doubt we will be able to get the system to say where each item goes, but I hope we can pick the items we made.
Then again, remember unless if you mod the game. Names of who made whatever will be marked as blank as the person is deleted. Something I think is BS in to itself. How much resources is it to keep a static image and names (text).