Mary Percy noblewoman; (1878-1965) (1878–1965) Parents Henry Percy, 7th Duke of Northumberland Edith Campbell Children Christian Maxwell Sir Aymer Maxwell, 8th Baronet Gavin Maxwell Eustace Maxwell Siblings Alan Percy, 8th Duke of Northumberland Lady Muriel Percy Lady Margaret Percy Lord James Percy Louisa Percy Josceline Percy Henry Percy, Earl Percy Lady Victoria Percy Ralph Percy Eustace Percy, 1st Baron Percy of Newcastle Lord William Percy Lady Edith Percy Partners Aymer Edward Maxwell