Mary, Princess Royal and Countess of Harewood is your second great aunt's brother's wife's great nephew's wife's mother's husband's third cousin's 1st wife.
You → Millicent Susan Whiting (your mother) → Francis Henry Thompson (her father) → Margaret Mary Dobson (his mother) → George Dobson (her brother) → Martha Cosgrove (his wife) → John Cosgrove (her brother) → Emma Dorcas Palmer (his wife) → Florence Christiana Palmer (her sister) → Roberta Ida Freeman McAlpine (her daughter) → Owen Lloyd George, 3rd Earl Lloyd George of Dwyfor (her son) → Josephine Countess Lloyd George of Dwyfor (his wife) → Elizabeth, Countess Cawdor (her mother) → John Campbell, 5th Earl Cawdor (her husband) → Joan Emily Mary Thynne nee Campbell, Countess Cawdor of Castlemartin (his mother) → John Charles Thynne (her father) → Rev. Lord John Thynne (his father) → Louisa Lascelles, Countess of Harewood (his sister) → Henry Thynne Lascelles, 4th Earl of Harewood (her son) → Henry Lascelles, 5th Earl of Harewood (his son) → Henry Lascelles, 6th Earl of Harewood (his son) → Mary, Princess Royal and Countess of Harewood (his wife)
