Although it looks like he took the cash and either put it in a boring bank or payed off debt. He didn’t put the money in some sort of fund for retirement or the kids. He’s clearly not rolling in dough.
I don't know about this particular form, but it wouldn't surprise me if they exempt their personal house, and this form only lists investment properties.
This is most likely correct. Anytime you apply for e.g. welfare they don't make you list your home, car, etc. But if you have a second car you have to list that.
Someone else said he sold his house when he got elected though, so maybe he actually doesn't own one.