Who is Jesus? This is the question Matthew is answering in his gospel and he begins that answer in the opening genealogy. Jesus is the Son of David and Son of Abraham. He is the rightful and promised Davidic king (2 Sam 7:4-17, Psalm 2, etc), and the one who will bring the blessing of Abraham to the nations (Gen 12:1-3; Gal 3:13-14). If we are to celebrate Christmas rightly it will be by worshipping Jesus as King and Saviour.