Do you normally create a version of your own family?

I sometimes do both. My first ever sim was actually based on my grandpa!

I actually create a save years ago on Sims 3 based on my family. For Sims 4, I have created a pretty much-updated version of said family, though the version of myself is always an alter ego. The usual reason I sometimes create a version of my own family and my extended family in the Sims is always a "what-ifs" scenario and wanted to see what the family tree would look like in the Sims. I don't play on this save, but that reminds me to update it. 

The game saves that I do play are often started very loosely based on myself, based on characters that are often on shows, movies, games, or just a random character that I create that appears in my mind. The oldest save that I have for Sims 4 was a premade character that had a storyline going on, and now I have no idea where's the storyline going to be next. I would say it's kinda like improv at this point.