Question: Who is Joan Of Valois, Duchess Of Alençon's maternal grandmother?
Sentence (from "Louisa Montagu Douglas Scott, Duchess of Buccleuch"): She was the paternal grandmother of Princess Alice, Duchess of Gloucester and of Marian Louisa, Lady Elmhirst, as well as the maternal great- grandmother of Prince William of Gloucester, Prince Richard, Duke of Gloucester and great- great- grandmother of Sarah, Duchess of York.
Relevant evidence: No