The very last thing you want to be in an Old Testament tale is the first born.
But weren't Enoch (taken directly into heaven without experiencing death), Noah (the only righteous man found on earth), Abraham (the father of the faithful and the recipient of God's inheritance), and Jesus (Son of God) all the first born?
Didn't Jesus have four older brothers and an undefined number of sisters?
Given that Jesus was born to a young and unmarried virgin, having four older brothers seems a bit unlikely. He did have a younger brother, though, James, and possibly other unnamed brothers.