Her father was Oswald Smith, of Blendon Hall (7 July 1794 – 18 June 1863), and her mother was Henrietta Mildred Hodgson (c. 1805–1891).
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.
Frances Hodgson Burnett | Henrietta Maria of France | William Hope Hodgson | Joel Hodgson | Hodgson | Henrietta Szold | Roy Hodgson | Henrietta, New York | Henrietta Crosman | Florence Henrietta Darwin | Queen Henrietta's Men | Mildred Pierce | Mildred Mangxola | Mildred Allen | Jules Hodgson | Henrietta Township, Hubbard County, Minnesota | Henrietta Township | Henrietta | George and Mildred | Emily Henrietta Hickey | W. N. Hodgson | William Ballantyne Hodgson | Ralph Hodgson | Mildred Pierce (film) | Mildred Miller | Mildred Gillars | Mildred Barya | Mildred Allen (soprano) | Henrietta, Texas | Henrietta Mildred Hodgson |