I´ve heard about tarzan and tangled and frost and so on, but this is the one I can se be tru, if you look at how they look. Dimitri and Tarzans dad is similar, and so i the women too. Fan theory: Anastasia and Dimitri are Tarzan's parents just older.
Tarzan’s parents are the King & Queen in Frozen! (From today’s Pixar AMA: “[Elsa & Anna’s parents] got washed up on a shore in a jungle island. The queen gave birth to a baby boy. They build a treehouse. They get eaten by a leopard…”)