Did anyone know this before?

It is just a प्रशंसक fiction, although it could be considered as partially true.

In my fandom, the Queens aren't the ones who are related; but the क्वीन of Corona and the King of Arendelle are. They have much और in common. आप may find an लेख या post in a फ्रोज़न fandom site या in Tumblr

In some other stories, they claim that Ariel's sunken ship may also be the sunken ship of the King and क्वीन of Arendelle. It could be true since Arendelle is located in Norway, and The Little Mermaid could originate from Denmark.

If आप take the Coronation Cameo Theory of the fandom, the ship may have passed द्वारा Denmark on it's way to the Kingdom of Corona in Germany. It may have sunk there.

It's funny on how everything is connected in most डिज़्नी Princess movies.

Here's a link to better explain the answer:
link

Uh.. I do not think so... I think Anna, Rapunzel and Elsa are just friends

no i didn't

that's true

Yeah, I've heard of things like this before. It could be true.

It's an Easter egg, planted from the animators to दिखाना the connection between टैंगल्ड and Frozen, so yes, it is true.