James Douglas, 3rd Lord Mordington, married Anne (b.1651) daughter of Alexander Seton, 1st Viscount of Kingston by his first wife, Jean (d. August 1651), daughter of Sir George Fletcher, of the Innerpeffer family.
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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.
Sir Alexander Seton, 1st Viscount of Kingston (13 March 1620 – 21 October 1691), a Cavalier, was the first dignity Charles II conferred as King.
It was created in 1605 for Alexander Seton, 1st Lord Fyvie, fourth son of George Seton, 7th Lord Seton (see Earl of Winton for earlier history of the family).
These include the ceiling at Prestongrange, undertaken in 1581 for Mark Kerr, Commendator of Newbattle and the long gallery at Pinkie House, painted for Alexander Seaton, Earl of Dunfermline in 1621.
Whittingehame passed to his brother Sir William Douglas of Stoneypath, near Garvald, whose daughter Isobel married, in 1628, Sir Arthur Douglas of the Kellour family, and their daughter Elizabeth (1632–1668) married, in 1652, Alexander Seton, 1st Viscount of Kingston and carried Whittingehame to him (Elizabeth's brother Archibald having died unmarried).