On 2 November 1974, Gowrie married Adelheid "Gräfin" von der Schulenburg (b. 24 October 1943), sixth and youngest child and fifth and youngest daughter of Fritz-Dietlof "Graf" von der Schulenburg (1902–10 August 1944), a German "Graf" (Count) and one of the leaders of the 1944 plot to assassinate Hitler, and his wife Charlotte Kotelmann.