Question: Who is the mother-in-law of Fortune Fitzroy, Duchess Of Grafton?
Sentence (from "Hugh FitzRoy, 11th Duke of Grafton"): Hugh Denis Charles FitzRoy, 11th Duke of Grafton (3 April 1919 – 7 April 2011) was the son of Charles FitzRoy, 10th Duke of Grafton, and his first wife Lady Doreen Maria Josepha Sydney Buxton, second daughter of Sydney Buxton, 1st Earl Buxton.
Relevant evidence: Yes