Edit the relationship / Household

I have loaded different households from the community but if I want to edit the household I can not change the relationship status. I've tried everything possible. Household in a house or not in the world. Saved the household so that he was created by me and not saved to the original creator.

BUT .... It has been working but I do not know how ☹️ I have loaded the characters from The Big Bang Theory and they were all set as roommates. I could modify it somehow eg Sheldon and Amy are married. Only Howard and Bernadette were already a couple.