No, they are not related. From Nancy Rubin Stuart, Author, American Empress: The Life and Times of Marjorie Merriweather Post ( Villard Books, 1995; ASJA PRess, 2003)
36
YES!!!!!!!!!!!!!!!!!!!!!!!!!.
Mike Post was born on September 29, 1944.
Markie Post was born on November 4, 1950.