Margaret Arbuthnott (died 1801) (1752–1801) Parents John Arbuthnott, 6th Viscount of Arbuthnott Children John Dunbar Sir Archibald Dunbar of Northfield, 6th Bt. Jean Dunbar Siblings John Arbuthnott, 7th Viscount of Arbuthnott Robert Arbuthnott Partners Sir Alexander Dunbar of Northfield, 5th Bt.