Melvin, a British author living in America, returns home to London for Christmas to introduce his American fiancée Lisa to his eccentric British-Caribbean family. Their relationship is put to the test as she discovers the world her fiancé has left behind.Source: TMDb
Currently, you can only stream Boxing Day on Prime Video in the United States.
Unfortunately, you cannot buy or rent Boxing Day on any of the streaming services in the United States at the moment.
Boxing Day was released last year (2021).