I don't play it a lot anymore but my Westbrook save is still one on my favorites. It's rotational but all households are descendants of my founding Sim, Emilia Westbrook and Paolo Rocca. It started out as the "I'm a Lover" Challenge but quickly became a rotational save. It was actually one of my first times playing rotational.
Like I said, I don't play it very often anymore. I got frustrated when I realize I had skipped generation 4's toddler pictures and lost all motivation. Until that point, I had every single lifestage of every single sim documented.