"One last thing, Miss Granger," Quirrell added. "I w-would advise you to research your f-family tree. Talk with your parents, if th-they are still alive. It might be w-wise to double-check if you are indeed a M-muggle-born or not. Perhaps you were adopted, or perhaps your family descends from a Squib line of the Dagworth-Grangers, or a mixed m-marriage where one of your grandparents n-never told anyone th-they were a witch or wizard, for f-fear of being thought m-m-m-mad. It would n-not be the first time that such a situation has arisen, with s-someone thought by so many to be a nobody Muggle-born, who t-turns out to in fact be descended from a wizarding line of s-some renown."