Alexander Duff of Davidson (1725-1778) (1725–1778) Parents John Duff Mary Gordon Children Archibald Duff, 7th of Drummuir William Duff John Duff, 6th of Drummuir Siblings Lachlan Duff Gordon, 8th of Park John Duff William Duff James Duff Catherine Duff Partners Magdalen Duff