Donald Trump Jr.  and Eric Trump, who are handling the president’s business affairs while he’s in office, as well as Tiffany Trump, showed up at the state banquet and for other parts of the president’s visit, with no explanation for their presence from the White House. 

…Asked why the president’s three adult children who aren’t in the administration were on the state visit, and who paid for their travel and related expenses, a White House official didn’t address why they were there. “They are personally paying,” the White House official responded. 

Why were Trump’s adult children on his state visit to the U.K.? – CBS News

hmmmm