Mary, Queen of Scots and Elizabeth I
The Tudors are a great contender for the most dysfunctional family of all time. Queen Elizabeth I, let's not forget, was born to the legendary jerkface Henry VIII and poor Anne Boleyn, who would end up beheaded when her daughter was only two. Elizabeth was thus hardly sentimental over family matters, let alone over her cousin and longtime rival Mary, Queen of Scots. Catholics believed Mary was the rightful queen and supported her many attempted coups against Elizabeth. Elizabeth, forever the cold yet brilliant politician, won out. Mary was executed in 1587, and the Tudor line died with Elizabeth in 1603.