Question: Who is the mother-in-law of Sophia Sidney, Baroness De L'Isle And Dudley?
Sentence (from "Sophia Sidney, Baroness De L'Isle and Dudley"): Sophia Sidney, Baroness De L'Isle and Dudley ("née" FitzClarence; August 1796 – 10 April 1837) was the eldest illegitimate daughter of William IV of the United Kingdom and his longtime mistress Dorothea Jordan.
Relevant evidence: No