American actress, the twin sister of Margo Sage; they were the daughters of Oliver Hardy's half-sister, Elizabeth Tante Sage and her husband Ira Yale Sage Jr. They had another older brother, Ira Yale Sage III (1902-1980). Both sisters mainly lived in Georgia, where they headed back to after their brushing with Hollywood. Between 1930-1937, she married William Olin Adcock (1901-1989); they had at least three children.
One source lists Mary's middle name as Northern, and another gives it as Elizabeth; but I have had confirmation from Mary's granddaughter that it was in fact Norvell.