This is the Julio-Claudian family tree, at least according to Wikipedia (there are several minor variations, but let's not get too technical).
Now, the challenge is to re-create the entire family using Sims characters. How far can you go? I managed to get to Claudius, but I cheated Caligula – couldn't find a horse for Sims 2, and avoided any reference to his relations with his sisters.
The trick is to figure out when to marry couples that will later on become relatives by adoption – because the game wouldn't let me marry two Sims that were related, even if they weren't blood relatives. Bleah. That's why the Sims never conquered the world.
Also, killing Sims is way more difficult than killing your own family members – when you belong to the Julio-Claudian dynasty, that is.