Incest relationship issue

This is an issue i had a few months ago already and broke them up so I don't need help with It I just remembered It and thought It might be a good idea to report it. On an older save i had I wanted my teen sim to be in a relationship but the teen I wanted them to be with had a lover already, so I checked that Sims household to break them up, turns out she had a whole pink bar with her father??? I DON'T have any mods that allow this and I never even played with that household, I just moved them to a random lot to be able to quickly find them but that household was in "other households" category which means it happened by itself, which is so weird because they're not only father and daughter but also teen and young adult so it shouldn't have happened. There's a photo below where I translated the more important parts to English, because I thought the chances of EA seeing this issue are higher on the English forum than the Polish one.