 was the brother of William Desmond Taylor and nephew of Charles Kearns Deane Tanner.Denis Gage Deane-Tanner was the fourth of five children born to Jane O'Brien (of Carlow, Ireland) and British Army Major Thomas Kearns Deane-Tanner (of Cork, Ireland) in what is now Carlow, Ireland.Denis was raised at the family home, Straw Hall, until he attended school at Pooles House, Clifton College in England.