Bernard Pares was one of ten children of the marriage between Katharine () and John Pares; he had four brothers (George (Lancelot),
Norman, Basil and Howard) and five sisters (Alice, Ethel, Margaret, Constance and May). His father was the son of
Thomas Pares (1790–1866), who was
M.P. for
Leicester from 1818 to 1826. His mother was the sister of Admiral Sir
George Back FRS (1796–1878), the explorer and naturalist. They were a wealthy family, and he inherited a large sum that enabled him to live comfortably despite low academic salaries. Pares was educated at
Harrow School and
Trinity College, Cambridge, where he graduated in Classics taking a third. He worked over the next ten years as a school teacher spending his vacations touring the main battlefields of the
Napoleonic Wars. He married Margaret Ellis, daughter of Edward Austin Dixon, a dental surgeon in Colchester. They had three sons, Peter (who became a diplomat), Andrew (who became a soldier) and
Richard (a historian), and two daughters, Elizabeth, who was Head of the Foreign Research and Press Service, Baltic Section at
Chatham House during WWII and
Ursula (Susan), who married Sir
Geoffrey Jellicoe, the landscape architect, becoming an eminent plantswoman and photographer in her own right. His niece through his brother Basil was the artist and illustrator
Bip Pares. ==Russia==