Mary Cosby and Robert Cosby Sr.
Indeed, Mary Cosby has the most unusual, stereotype-defying relationship on this entire list. In fact, we’re pretty sure it would be against the law in some countries. Pastor Mary Cosby is a cast member of The Real Wives of Salt Lake City and is married to her grandfather.
When Mary Cosby’s grandmother died, she bequeathed her church, properties, and spouse to her granddaughter. As a result, the reality star became the step-grandfather of their family.