Well, let’s go down that road.
How about Winston Churchill?
“Churchill was born into the family of the Dukes of Marlborough, a branch of the Spencer family. His father, Lord Randolph Churchill, was a charismatic politician who served as Chancellor of the Exchequer; his mother, Jennie Jerome, was an American socialite. As a young army officer, he saw action in British India, the Sudan, and the Second Boer War. He gained fame as a war correspondent and wrote books about his campaigns.”
For that matter, all the girls in Downton Abbey could be President, since their mother is American.