A brother by adoption
He, Who was born of Mary was wholly divine.
He was completely from above.
He was the Word made flesh.
He became a Jew by the spirit of adoption.
When Joseph adopted Him, He became of the lineage of Joseph.
Jesus became Joseph's son by adoption.
Equally, Jesus is Russian, English, Chinese and so on by the same spirit of adoption.
When you adopt the words of Jesus, as your own, you have made Jesus your full brother.
Truly, Mary was the mother of God.
All, who believe on Him, have adopted Him into their households.