Which premade families do you keep?

I delete the households that have sims I've gotten close to in previous saves, in order to not cloud those memories. I don't delete the Goths or the Landgraabs, because I don't find them very relatable but they're an important part of the environment. With some others, like the Fengs, Kealohas, Bjergsons, and Zest-Pizzazz, I purposely give them toddlers (with play with genetics), because it's worked out so well in the past.