I too wish it would show case more complicated family relationships. The fact that a person can raise a child, from a child to an adult, as a parent (with all the same love and care) and still be labeled as nothing more than a roommate is very sad, and doesn't give us the chance to show off the more complex family dynamics of real life. I had one sim marry his fiance after she adopted two babies. The children weren't considered his in any way, but he ended up raising them as his own (becoming best friends with the adopted son and not his own flesh and blood younger son), but he was just a roommate in the end. That didn't seem to match as well. The parenthood pack helped a little with making them feel like a family though, but still they were technically roommates.
