Donald Trump's Great-Nephew William, 25, Is Nonverbal and Uses a Wheelchair. Here's What William's Dad Wants You to Know

Fred C. Trump III has been hoping this moment would arrive for more than 20 years — a moment when he can leverage his polarizing last name to advocate for the disabled community on behalf of his 25-year-old son, William, who has complications from a rare genetic mutation. Fred, a nephew of former President Donald Trump, recently entered the spotlight with the release of his book, All in the Family: The Trumps and How We Got This Way, in which he describes growing up in the Trump dynasty and details his experience raising a child with "complex" intellectual and developmental disabilities.