Lord David Crichton-Stuart (1933-1977); younger twin brother of John Crichton-Stuart, 6th Marquess of Bute (1933–1977) Parents John Crichton-Stuart, 5th Marquess of Bute Lady Eileen Forbes Children Elizabeth Crichton-Stuart Kenneth Crichton-Stuart Siblings John Crichton-Stuart, 6th Marquess of Bute Lord James Crichton-Stuart Lady Fiona Crichton-Stuart Partners Helen McColl