Who is Mr. and Mrs. Hoover from A Virtuous Woman and what is their importance?

The Hoovers are a well-to-do couple, who own a large farm. The farm has several tenant farmers on it, including Jack and Burr. Ruby, a white girl, works as a maid. Mrs. Hoover sees this as a status symbol. The Hoovers have a daughter Tiny Fran who has a baby out of wedlock.