His elder sister, Alice Whitehead, married Georg Anton, Count of Hoyos, and was the mother of Countess Marguerite (wife of Herbert von Bismarck, eldest son of Otto von Bismarck) and Alexander, Count of Hoyos.

[6][7] While in Constantinople, he acted as Chargé d'affaires in the absence of the ambassador during early 1903, and was received by the Sultan.

[8] In December 1903, he transferred as First Secretary to the embassy in Berlin, and on 1 April 1904 he was promoted to Counselor.

[9] He was appointed Envoy Extraordinary and Minister Plenipotentiary to the Kingdom of Serbia in June 1906,[10] serving as such until 1910.

Marian's brother St John Brodrick, became the 1st Earl of Midleton[12] Together, they lived at Efford Park, Lymington, and were the parents of:[13] Sir James died on 19 September 1928.