What is white christmas sisters?

"White Christmas Sisters" is a popular musical number from the 1954 film "White Christmas", starring Bing Crosby and Rosemary Clooney. In the movie, the song is performed by Clooney and Vera-Ellen, who play the Haynes sisters. The song features the two sisters singing about the joys of Christmas and their longing for a traditional snowy holiday. "White Christmas Sisters" has since become a classic holiday tune and is often performed in stage adaptations of the film.