Sheila Beddington was born in 1906 in Hampshire, eldest daughter of Claude Beddington and Frances Ethel Beddington (née Homan Mulock). She married on 28 August 1932, Major the Hon. Mervyn Patrick Wingfield, (1905-1973), great-grandson of the Earl of Leicester and Chief Commissioner for Scouts in Eire. Succeeded his father as 9th Baron Powerscourt, of Powerscourt, Co. Wicklow, and Baron Wingfield, of Wingfield, Co. Wexford. The Baroness was created Chief Commissioner of the Irish Girl Guides. Sheila inherited the estate at Bellair, Offaly from her aunt Hester Nina (Enid) Homan Mulock and sold it in 1963.
Sheila Wingfield is the niece of Enid Homan Mulock, Lady Nutting