Question: Who is the mother-in-law of Fortune Fitzroy, Duchess Of Grafton?
Sentence (from "Isabella FitzRoy, Duchess of Grafton"): Isabella Bennet FitzRoy, Duchess of Grafton and later 2nd Countess of Arlington" suo jure"( c. 1668 – 7 February 1723), was a British peer and heiress.
Relevant evidence: No