No family members stealing partners

[Nozza]

See title. Is there any way to stop family members from trying to start relationships with someone their relative is already in a relationship with?

I used Prepare Carefully to make a hypothetical scenario where characters A and B are brothers, character A and C are lovers, and character C has the beautiful trait. Character B keeps consistently flirting with character C and getting debuff penalties, even as C gets married. Doesn't quite seem right for your brother to try and steal your wife every three days.

[AileTheAlien]

In real life, no, but Rimworld is a story simulator.
Think of it like a cheap soap-opera show, romance / love-triangle novel, or film! :)