After most recent patch I noticed the inappropriate romantic relationship among family members (parent/child) bug. See attached showing the character's TEEN SON. Never experienced this bug before but...
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Step-siblings don't count as close-family members as far as I'm aware.
Do you have it among non-step relationships ?
I do, unfortunately. I have used UI cheats, and MCCC, and just regular vanilla cheats to remove the romance (or at least reassert the Sibling relationships) and they just keep coming back. I did remove a mod I had (Ballroom Dancing) that had an interaction that showed up for everyone as romantic despite family relationships, but that doesn't seem to have fixed it.
did you try removing all your mods/cc and see if it happens on a vanilla game ?
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