- Speaks Slovenian & English.
- First son to live in the White House since John Kennedy Jr..
- Is of Slovenian, German & Scottish descent.
- Cousin of clinical psychologist & bestselling author Mary Trump.
- Had an entire level of his family's 3-story Trump Tower penthouse to himself.
- Named after hotel heir William Barron Hilton.
- Played as a midfielder at RFK Stadium on the D.C. United Development Academy U-12 team (September 2017).
- Was born at 5:00 a.m. on March 20, 2006, weighing 8 lbs. & 5 oz.
- Half-uncle of Kai Trump, Donald Trump III, Tristan Trump, Spencer Trump, Chloe Trump, Arabella Kushner, Joseph Kushner, Theodore Kushner, Luke Trump & Carolina Trump.
- Second cousin of John Walter.
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