How often do you create families and households that have multiple sims?

If I am going to be actively playing a household, I tend to start with a single sim... maybe a pet with them. This is mainly because, if I'm actually creating a sim to play, it is 99% of the time going to be a rags to riches gameplay.

I mainly play in my legacy save though, so the families have been making themselves over the generations. If I do add a household to that world, then I will typically create a couple or parent(s) with kid(s) and/or pet(s).