The Sweetest Heir is an award-winning family comedy about a young girl, Brittany Thompson, who collects and restores old jewelry boxes. While restoring one, she discovers a seal and a deed for an unclaimed estate worth 450 million dollars. The deed clearly states that the bearer of both items will become the sole heir to the Winthorp Estate. With Christmas just two weeks away, the Thompson family unites to battle Ms. Stone, the late Ms. Winthorp`s maid, so Brittany can receive her rightful inheritance.