How many worlds/save files do you have?

I have 20+ on my computer, but most are not mine. I let my siblings play when I am home and never know if I should delete their saves or not. My sister likes to just create families, not play usually, and I keep telling her to put all her families in one save, but she doesn't. She creates a new save each time.
I have two saves that I actively play. Then a few others that I don't anymore but haven't deleted.
I think I voted for the wrong section, but whatever. There is definitely truth in my vote, though I don't know whether it's the most correct or not.