I posted about this same issue a couple weeks back... Now today a second sim has become stuck... So now I have two whom I cannot remove. Would be nice if someone fixed this.
This is not a technical issue but this bug: [Open] - Sims removed from household came back after May 7, 2021 update
a week ago
How do you make them removable or retire them though? My house has gotten full since my adult children i can't do anything with