The black-and-white film from the year Adolf Hitler came to power purports to show future British king Edward VIII instructing his nieces, the current monarch Elizabeth, aged about six or seven at the time, and her three-year-old sister, Princess Margaret, how to perform the Nazi salute.
In the context of the input sentence, determine the relationship between 'Edward VIII' and 'king'.
Options: headquarters location, chairperson, position held, product/material produced