Re: Landgraabs and Johnny Zest
This should work on console, and it's how I made Johnny their disowned son:
Start with the cas.fulleditmode cheat.
In Manage Households, add Johnny to the household.
If you want interim Sims in the tree, make new Sims as well.
Set the relationships you want. Delete any in-between Sims that you don't want, or kill them in live mode later. (This is how I've made grandparent-grandchild households sometimes.)
Save the household, then got to Manage Households and move any sims out you want.