Also, British and Swedish royal houses share common ancestors. She’s a third cousin once removed of Queen Elizabeth II. Queen Victoria is Princess Madeleine’s great-great-great-great grandmother, which makes her a distant heir to the throne. That follows the tradition of royal couples being related to one another. The reason Prince William didn’t marry Princess Madeleine is simple: he didn’t want to. Although the two had a moment where they almost got together. When Madeleine was attending school in London, rumors were swirling that King Carl XVI and Queen Elizabeth II were plotting to set them up. But apparently, Princess Madeleine turned down the offer, preferring to live more privately.