Question: Leonora Mary Grosvenor's father was the richest man in Britain in what decade?
Sentence (from "Leonora Anson, Countess of Lichfield"): Leonora, Countess of Lichfield, LVO (born 1 February 1949) was born as Leonora Mary Grosvenor, a daughter of the 5th Duke of Westminster.
Relevant evidence: Yes