Gaselee was born at Brunswick Gardens, Kensington, London, the eldest son of Henry Gaselee, a fellow of King's College, Cambridge, and his wife, Alice Esther (née Frost).
Gaselee was born at Brunswick Gardens, Kensington, London, the eldest son of Henry Gaselee, a fellow of King's College, Cambridge, and his wife, Alice Esther (née Frost).