Question: how are audrey and katherine hepburn related?
Answer: Audrey Hepburn and Katharine Hepburn were sisters (related; mother and daughter; aunt and niece; etc.) ... The two became pen pals in the '60s, after My Fair Lady was released; and Katharine famously wrote to Audrey after she failed to receive an Oscar nod for her role as Eliza Doolittle.