Just found out today -- Anna Leonowens, the real-life governess whose writings inspired the movie Anna and the King and then, of course, the Rogers and Hammerstein musical (and film) The King and I, was the great-aunt of . . .
. . . Boris Karloff.
My very favorite composer on the planet, Ralph Vaughan Williams, was the great-nephew of personal hero Charles Darwin and the great-great-grandson of Josiah Wedgwood, of pottery fame, for whom I entertain no particular affection beyond general admiration.