His daughter Mildred was the grandmother of Washington, while his daughter Mary is an ancestor of the Queen's mother, Elizabeth Bowes-Lyon.
Their granddaughter, another Mildred Porteus, married Robert Hodgson, of Congleton, and was the grandmother of Henrietta Mildred Hodgson (1805-1891), whose daughter Frances married Claude Bowes-Lyon, later Earl of Strathmore and Kinghorne and became the grandmother of Queen Elizabeth II.
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