Frozen Theory, Part 2: Chris Buck and Jennifer Lee, the directors of Frozen, confirmed during a reddit AMA that Elsa and Anna's parents were indeed heading to a wedding when their boat sank. According to Chris, however, they didn't die on that boat. They washed up on the shore of a jungle and the queen later "gave birth to a baby boy" and built "a treehouse" before getting "eaten by a leopard." Sound familiar? That's the beginning of the Disney movie Tarzan. So if this theory is correct, Tarzan is the son of the king and queen of Arendelle and the long-lost brother of Elsa and Anna. Of course, Chris could have just made that up on the spot, but we're choosing to believe it. Don't let go of that childlike wonder, guys!

Thank you to Dragonlord1432 for voting!