Veteran games dev community manager & designer. Loves 
He/Him
@Weealbet Seems I can get it all fixed and looking good in one household, but when I switch to another household they break again. :-(
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@Weealbet Even reloading the same household breaks relationships I fixed before saving. So, the verdict is that it only partially worked.
@Weealbet It seems relationships with sims outside the household are the one that tend to break.