JESUS IS MESSIAH. Remember this, during that time, the bloodlines ran through the father not the mother. Remember the angel of THE LORD appeared to joseph and called him 'son of david' this is because he was apart of the royal bloodline tracing all the way back to Abraham. This is why Mary and joseph needed to be married because then JESUS WOULD legally be joseph son and an heir to The Throne. Had JESUS been born of Mary and she were not married to joseph then JESUS Would not have been an heir because HE Would have no ties to a heir of david.