In July 1931 in Oslo he married Rosemary Blackadder (1901–1975), a Scottish journalist and artist, daughter of John Blackadder and wife Anna Wilson, and this morganatic marriage made him ineligible to be Duke (Herzog) of Urach. They had a daughter Marie-Gabrielle, a.k.a. "Mariga", who married Desmond Guinness. Rosemary returned alone to Britain in 1938.
