I have more premades in my game than I want to admit. Basically I create ,y own sims and stories, and playing 100+ households on rotation doesn't leave a lot of time for the premades. I often use them to get a family going, then focus more on their offspring, and some premades are not very actively played. For the Landgraabs, Crumplebottoms, Fyres, Altos, Elderberry, Ward and Hoapili I made sort of detailed backstories. My
full household index can be found on my website. Individual bio pages have link to their family tree.
I mostly go with the general lore, though.