NEW YORK — Former President Donald Trump and two of his children got their questioning postponed Friday in a New York civil investigation into their business dealings, a delay that follows the death of Trump’s ex-wife Ivana.The ex-president, son Donald Jr. and daughter Ivanka had been scheduled for depositions — a term for out-of-court questioning under oath — starting as soon as Friday. But New York Attorney General Letitia James’ office said it had agreed to postpone them because of Ivana …