Muggle-born is the term applied to wizards and witches whose parents were Muggles. J.K. Rowling has said they are second-most common of the three types of blood status wizards, numbering about 25% in the Wizarding community. They are often believed to be descended from Squibs who married Muggles, and the dormant magical gene may resurface after a couple of generations. Harry Potter's mother, Lily Evans, and his best friend, Hermione Granger, were Muggle-born. Unlike children of Wizarding families who get a Hogwarts acceptance letter from an owl, a Hogwarts employee will usually hand-deliver the letter to Muggle-borns in order to meet the Muggle parents and explain.