1. The means of raising it, probably leading to the size of it.
2. No, but they wouldn't be bothered to do it if it wasn't huge. They were wealthy already.
3. Earning in a way that didn't rely totally on their father's name and influence.
But I suspect you already knew all this.
Do you believe that it is perfectly fine for the members of a "First Family" to exploit their positions in this way? (This could also apply to members of our "First Family").