Isabel Bowes-Lyon
He is a great-great-grandson of the 14th Earl of Strathmore and Kinghorne and a great-grandnephew of Queen Elizabeth The Queen Mother. Lord Elphinstone's paternal grandfather, Rev. Hon. Andrew Elphinstone, was a first cousin of Elizabeth II, through his mother, the former Lady Mary Bowes-Lyon, who was an elder sister of Queen Elizabeth The Queen Mother.