Barron Trump’s aborted installation as a Florida delegate at the Republican National Convention was the latest attempt by his father to make the presidency and the Republican Party a “family business,” his niece said Saturday. Donald Trump’s 17-year old son was announced to be entering politics and attending the convention in Milwaukee in July, where he would nominate his father as the party’s presidential nominee. But just days after the news was revealed, the office of his mother Melania Trump shut it down in a statement which read: “While Barron is honored to have been chosen as a delegate …