"Billy Beer". That's an American icon, symbolic of the long time problem presidents have had with their relations. Jimmy Carter's younger brother Billy got himself into trouble several times, most notoriously by endorsing Billy Beer. Just within my memory, LBJ, Nixon, Reagan, Clinton, all had problems with siblings or children. Going further back, Lincoln had in-law problems and Adams had children problems.
So all in all I don't take the problem of Jared Kushner's sister pitching EB-5 visas in China too seriously. It's unseemly, but we can't expect saintliness.