Question: Who is Sir Alexander Cornewall Duff-Gordon, 3Rd Baronet's mother-in-law?
Sentence (from "Lucie, Lady Duff-Gordon"): She is best known for her "Letters from Egypt, 1863–1865" (1865) and "Last Letters from Egypt" (1875), most of which are addressed to her husband, Alexander Duff-Gordon, and her mother, Sarah Austin.
Relevant evidence: Yes