You are all successful, honorable adults except Barron, but I'm sure he will grow up to be a fine adult too. I know you love your father, so please, please, tell him to stop running for President. He does not have the political experience to be President and he does not have the temperament to be President. Running a Country is not the same as running a Country Club. If Donald wants to "Make America Great Again," he should start by running for Congress or the Senate first.
Many American citizens are fed up with "politics as usual" and want someone outside of politics to lead the country. They see Donald Trump as the outsider they are looking for, but Donald Trump is not that person. Experience matters, even in politics, when it comes to being in charge.
Your father is running as a successful businessman, but most of his businesses have failed. Mitt Romney on the other hand has been a very successful businessman, so he can be legitimately critical of your father's business failures.
I didn't vote for Mitt Romney in the last election because I considered him an elitist and out of touch with most Americans, but Romney has shown some real courage in opposing Donald Trump's nomination for the Republican Party. Here's a link to a video of Romney's speech against Trump's Presidential ambitions.
Politics is not like business. Mitt Romney was not only a successful businessman but a successful Governor of Massachusetts, a very liberal state. William Weld was also a conservative Governor of Massachusetts, and he is running for Vice President on the Libertarian ticket with former New Mexico Governor Gary Johnson. Both of these men have more government experience to be President than Mr. Trump.
Politics can be very vicious, and I'm sure Hillary Clinton's campaign will not treat Donald kindly. Whatever bad things that can be found out and said about him will be spread all over her political ads. It will be cruel. You don't want him subjected to these attacks. He has a very fragile ego that rejects even the mildest criticism.
I'm really beseeching you, both for the good of the country and the good of your family. I am not a Doctor or Psychiatrist, but your father's behavior appears to fit the description of Narcissistic Personality Disorder. This is a serious mental condition and he should be evaluated by Doctors before Mr. Trump is caught up in the political fray.