- Uncle of Tom Udall
- Despite losing an eye in a boyhood accident, he went on to play professional basketball with the Denver Nuggets of the old National Basketball League, 1948-1949.
- Half-1st cousin, once removed, of Gordon Smith (Smith's grandfather and Udall's father were half-brothers)
- Younger brother of Congressman Stewart L. Udall.
- Cousin of Nick Udall, mayor of Phoenix, Arizona from 1948-1952.
- Father of Congressman Mark Udall and Kate Udall.
- (1961-1991) U.S. Congressional representative from Arizona
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