Question: Who is the sibling-in-law of Ella Eaton Kellogg?
Sentence (from "John Harvey Kellogg"): Many of the vegetarian foods that Kellogg developed and offered his patients were publicly marketed: Kellogg is best known today for the invention of the breakfast cereal corn flakes, originally intended to be an anaphrodisiac, with his brother, Will Keith Kellogg.
Relevant evidence: Yes