 His grandson through his son Osborne, Major-general Henry Osborne Curtis (1888–1964), was a British Army officer who saw service in both World War I and World War II who was awarded the Companion of the Order of the Bath, the Distinguished Service Order, the Military Cross, and the U.S. Army Distinguished Service Medal.His granddaughter through his son Ralph, Sylvia Curtis (b.1893) was married to Alexander Steinert with whom she had two sons, Russell Curtis Steinert (1927–2010) and Theodore Curtis Steinert.