Violet Magdalene Astor is a daughter of a 7th cousin of Harry James Heathcoat-Amory.
Indeed,
Charles Lennox, Duke of Richmond (1701-1750) and
Sarah Cadogan (1706-1751)
are at the same time
ancestors of the 8th generation of Harry James Heathcoat-Amory
ancestors of the 9th generation of Violet Magdalene Astor