Okay so I don't know what's going on. I made a Sim and his Brother. One Sim had 2 kids and a wife, and now their relationships are all screwed up. I can't make my Sim the uncle to the children, only B...
This is a problem again since patio (Or Newcrest patch) for me, suddenly I can't add new relatives such as parents to an existing household or one from my gallery. :(