Was the song once upon a December really sang by anastacia romanov and her grandmother?

The song "Once Upon a December" was not sung by Anastasia Romanov and her grandmother. It is a song from the 1997 animated film Anastasia, which tells a fictionalized version of the story of the Russian princess Anastasia. The song is sung by the character Anastasia, who is voiced by Meg Ryan in the English version of the film.