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.
Refer to the input text as context and select the correct relationship between 'Edward VIII' and 'king' from the available options.
Options: headquarters location, product/material produced, chairperson, position held