David Erskine, 9th Earl of Buchan Scottish nobleman and politician (1672–1745) Parents Catherine Stewart Henry Erskine, 3rd Lord Cardross Children Henry David Erskine, Lord Auchterhouse Lady Frances Erskine Lady Katherine Anne Erskine David Erskine, Lord Auchterhouse Henry Erskine, 10th Earl of Buchan Siblings William Erskine Thomas Erskine Charles Erskine Partners Frances Fairfax Isabella Blackett