Francis Martineau Lupton was the great - great - grandfather of Catherine , Duchess of Cambridge .
Leeds politician , Francis Martineau Lupton , ( who ) was the first cousin of Lady Airedale 's mother -- Baroness von Schunck ( nee Kate Lupton ) .
Kate Lupton     was the Kate Lupton         of Catherine , Duchess of Cambridge .
Leeds politician , Francis Martineau Lupton , ( who ) was the first cousin of Lady Airedale 's mother -- Baroness von Schunck ( nee Kate Lupton ) .