en_tn/mat/01/01.md

General Information:

The author begins with Jesus' genealogy in order to show that he is a descendant of King David and of Abraham. The genealogy continues through Matthew 1:17.

The book of the genealogy of Jesus Christ

You could translate this as a complete sentence. AT: "This is the list of the ancestors of Jesus Christ"

Jesus Christ, son of David, son of Abraham

There were many generations between Jesus, David, and Abraham. Here "son" means "descendant." AT: "Jesus Christ, a descendant of David, who was a descendant of Abraham"

son of David

Sometimes the phrase "son of David" is used as a title, but here it seems to be used only to identify Jesus' ancestry.