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.
Analyze the relationship between 'Edward VIII' and 'king' within the context of the input sentence.
Options: product/material produced, chairperson, position held, headquarters location