How to keep family tree when creating new save?

I’ve moved about 16 sims before. I moved them as 2 households to save most of the family connections. After I moved sims between each household and using cas.fulleditmode cheat I connected them to the family again. It’s a somewhat long process but they were connected at the end as usual.
If it was less than 8 sims I’d move them to 1 household and once in the new save, move them out and recover their money and house using cheats