The youngest of four children , her paternal grandfather was Sir Mountstuart Elphinstone Grant Duff .
Ursula Lubbock , Shiela Grant Duff was born in the Grosvenor Square home of her maternal grandfather , Sir John Lubbock .
The youngest of four children , Shiela Grant Duff 's paternal grandfather was Sir Mountstuart Elphinstone Grant Duff .
Ursula Lubbock , Shiela Grant Duff was born in the Grosvenor Square home of her maternal grandfather , Sir John Lubbock .