So, I was reading on a wiki that when you have great-GP's in S2, they don't appear relative to the youngest generation. Say I have Robert Johnson, and he's dead, but a custom character, so technically he's the reator of the family, and as such, he's at the top of my tree. Then, 4 generations later, there's Mary-Ann and Genevieve Johnson. How come Robert isn't on their family trees, and vice versa, even though they are related?

http://faiuwle.wikidot.com/sims2hacks

I don't know if they will show in the family tree per say but they do considered them family.