His father was William Seton II, captain in the U. S. Navy, son of Elizabeth Ann Seton; his mother was Emily Prime.
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Burke's Peerage (1900) recognized him as the head of the Seton family of Parbroath, senior cadets of the earls of Winton in Scotland.
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He was the son of Alexander Seton, Lord Gordon (d. 1440) (2nd son of Sir William Seton of that Ilk), by his spouse Elizabeth Gordon (d. 16 March 1439), daughter and heiress of Sir Adam Gordon of that Ilk.