Question: who are the wyrd sisters?
Answer: Wyrd Sisters features three witches: Granny Weatherwax; Nanny Ogg, matriarch of a large tribe of Oggs and owner of the most evil cat in the world; and Magrat Garlick, the junior witch, who firmly believes in occult jewelry, covens, and bubbling cauldrons, much to the annoyance of the other two.