He married Victoria Mary Stewart in 1894, and the couple had three sons--Leslie Hugh Callendar, Guy Stewart Callendar, and Max Victor Callendar--and a daughter, Cecil Callendar.
Hugh Masekela | Hugh Jackman | Hugh Grant | Hugh Laurie | Hugh Hefner | Hugh | Hugh O'Brian | Hugh Grosvenor, 2nd Duke of Westminster | Hugh Percy, 2nd Duke of Northumberland | Hugh Percy, 1st Duke of Northumberland | Hugh Martin | Hugh Dennis | Hugh Walpole | Hugh O'Neill, Earl of Tyrone | Hugh de Lacy | St Hugh's College, Oxford | Hugh Wheeler | Hugh Trenchard, 1st Viscount Trenchard | Hugh Trenchard | Hugh Pughe Lloyd | Hugh MacDiarmid | Hugh Lloyd | Hugh Greene | Hugh Carey | Hugh Wolff | Hugh Trevor-Roper | Hugh Shelton | Hugh Price Hughes | Hugh O'Neill | Hugh Latimer |