Betty St Clair Clay was the younger daughter of Olave Baden-Powell, the first Chief Guide and Robert Baden-Powell, 1st Baron Baden-Powell, the founder of Scouting. She was the sister of Peter Baden-Powell, 2nd Baron Baden-Powell; the aunt of Robert Baden-Powell, 3rd Baron Baden-Powell, and Michael Baden-Powell, 4th Baron Baden-Powell; the grandmother of murderer, Gerard Baden-Clay; the niece of Agnes Baden-Powell and Baden Baden-Powell; niece and goddaughter of Warington Baden-Powell; and granddaughter of the Rev. Prof. Baden Powell.

Olave St Clair Baden-Powell, Baroness Baden-Powell was the first Chief Guide for Britain and the wife of Robert Baden-Powell, 1st Baron Baden-Powell. She outlived her husband, who was 32 years her senior, by over 35 years.