Historically, I ride alone on trails about 90% of the time. My brother-in-law rides with me now and then, and by himself probably 90% of his trail rides.
I ride with family about 30-40% of the time on bike paths.
This year, I'm bringing my 8 year-old on the trails, but we haven't started yet. All the snow melted last weekend and it's drying out, so I'll report back in a few months as to how much he's going with me.