Question: Who is the maternal grandfather of Rose Wilder Lane?
Sentence (from "Laura Ingalls Wilder"): Laura Elizabeth Ingalls Wilder (February 7, 1867 – February 10, 1957) was an American writer known for the "Little House on the Prairie" series of children's books, published between 1932 and 1943, which were based on her childhood in a settler and pioneer family.
Relevant evidence: No