At the beginning of Frozen, we learn Anna and Elsa’s parents perished at sea during a tragic shipwreck, but maybe they didn’t actually die—not right away, at least. This theory suggests their parents washed ashore in a jungle with their newborn baby boy. Enter: Tarzan. We already know his parents were stranded on the island after their boat caught fire, so these two storylines actually fit pretty well together. Not to mention the co-director of Frozen, Chris Buck, has actually confirmed this theory is true: “In my little head, Anna and Elsa’s brother is Tarzan.” So there you have it; the King of the Jungle is also the Prince of Arendelle, at least according to Buck.