W. A. Churchill's brother was the diplomat Henry Adrian Churchill who was the Zanzibar Counsel from 1867 to 1870. H. A. Churchill had a long diplomatic career, seemed interested in helping the people wherever he served, wrote an article on cholera in Zanzibar in 1870, corresponded with scientists about the possible use of a certain Chinese bird to reduce the swarms of mainland Tsetse flies and acted as a mentor for the more famous British Counsel John Kirk, who served as his surgeon and vice-counsel during those years.
Ndugu wa W. A. Churchill alikuwa mwanadiplomasia bwana Henry Adrian Churchill ambaye alikuwa mshauri wa Baraza la Zanzibar tokea mwaka 1867 hadi mwaka 1870.