You might want to advise your nephew that people of real wealth don’t have to brag about it. The people whose cocktail party chatter consists of how much their stock portfolio is worth, the raise they just got, the incredible deal they got on their new sports car, etc are not only boring to listen to, but quite often liars.
True wealth doesn’t have to advertise. Also, the people who brag get hit on by salesmen of all types – another reason to just shut up about it and enjoy your treasures with the trusted few.