Guy David Innes Ker was born on 18 November 1954, the eldest son of the 9th Duke by his second wife (Margaret) Elisabeth McConnell (1918–1993).

The Duke had a younger brother, Lord Robert Innes Ker (born 1959), who is married with one son and one daughter.

[3] The Troop landed at San Carlos Water with 40 Commando, and over the course of several battles supported the Marines, 3 Para and the Scots Guards.

He succeeded his father to the title of Duke of Roxburghe in 1974, also becoming the premier baronet of Scotland, and the 30th feudal baron of Innes.

In 1987, he served as a judge in Prince Edward's charity television special The Grand Knockout Tournament.