I suspect you have already answered your own question within your original post.
I've made other families to test if has something to do with multiple sims but everything I create works fine. The game doesn't throw any errors, and other than that, everything seems to be working.
This tells me that the answer is probably a corrupted sim or household.
Have you tried fixall, or even maybe restsim?
Talking about Sims 3. Just using "boolprop" as shorthand for boolean variable.
Why even bother using "boolprop" in association with TS3 as there is no requirement to type that in any of the cheat commands, as was the case with TS2, which is what may lead to people getting confused about whether your actually referring to TS2 or 3.