I have testingcheats turned on, but as of the last patch, this option is not showing. Add to Family shows though, and works, but Remove is nowhere to be found.

I have reloaded the game and even let it fix itself just in case, but it is still missing.

Is this just me or is this the case for everybody?

Nope, screwed up for me as well. Anybody know of a fix?

My ctrl & shift & c for testing cheats on doesn't work. Are there any cheats that are working?

Yeah, this seems to be broken
you can use MCCC alternatively to move a sim into an existing household or a new one
I believe it's under Maintain Sim > Move sim (on the sim itself)

(you can also just use Manage Households to split up an household, but it would be easier with MCCC)

Do you have any old mods?

I know you might be trying to be helpful but be aware this is a thread from 2019.