Quite a few. Of course, they weren't Presidents yet, but then that happens when you have to get elected.
The relevant comparison is to the PMs.
I would love to hear some examples of US Presidents and their families being involved in the sort of examples I quoted you, that is leading from the front, not from a desk. I don't doubt they did it, I just can't find reference to any.
The relevant comparison would not be PM's as they are not head of state and we have only had PM's for a few hundred years, we have had monarchs for 1200 years as England and some 3000 years before the regions became one nation.