Why is the genealogy of Joseph given preceding the story of Christ's birth when His true Father was the Lord Himself?

The genealogy of Joseph is presented before Christ's birth to establish Jesus' legal lineage and fulfill Jewish Messianic prophecies, which emphasized that the Messiah would come from the line of David. By tracing Joseph's ancestry, the Gospel emphasizes Jesus' rightful claim to the throne of David, even though His true Father is God. This lineage also underscores the importance of Joseph's role in the narrative, highlighting his obedience and acceptance of his responsibilities as Jesus' earthly guardian.