This morning I happened across a thread on the official Sims 3 forums which details the Legacy Challenge rules. You have to start with one Sim, move them into a specified lot (15 Summer Hill Court for the Sunset Valley neighborhood, which is where the Splines live) and go through 10 generations with no cheating.
Whimsical deity that I am, I promptly moved Marla out of Spline Manor and took away all the cool stuff she had inherited.
The move leaves your founder Sim with §1,300. In a world where waffles cost §11, that’s not going to buy much.
In point of fact, it’s just about enough to buy a bed, and a length of unfinished wall.
Fortunately, the fitness center downtown has a fridge. There’s no way to cook food, but you can at least make yourself a bowl of cereal.
After eating gym cereal, Marla struck up a conversation with Ernest Ridley. Good news, he’s single! And he seems sympathetic to her ordeal.