Soooooooo.... This may come as a strange story to some, but hear me out.
In one of my 'hoods, Jason Larson is gay. He got married to one of my sims, Isaak. Jodi is an interpretive dancer, and lives with them in their very nice house.
I thought it would be cool (And this does happen in real life) to "inseminate" Jodi with Isaak and have her be their surrogate. Once she has the baby, I'd move her out. However, that means that Jason wouldn't be the father in the kid's tree, but rather the uncle.
I'm going to go and assume if I try to attach Jason to the unborn baby's tree, while keeping Jodi, that'll break my game, right?