Because Elsa feels responsible for the shipwreck and doesn’t want to see her sister in danger, the ice queen goes off on her own to “seek the truth.”
The song touches upon the sisters’ relationship with their mother as they attempt to decipher the secrets they have kept from them.
This outtake is an incredible duet between Elsa and Anna (although it was never recorded by Idina Menzel or Kristen Bell).
Based on the lyrics, it seems like it would have been performed at the point of the film when the sisters have discovered the ship their parents were on when they died was en route to the Dark Sea.
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Kristen Bell - Home (From "Frozen 2"/Outtake/Audio Only)