The term “brothers” is used to refer to close male relatives.
Jesus would not have had to tell St. John to care for Mary at his death because one of his brothers would have done it.
Mary remained a virgin through the birth of Jesus, and after. Mary was the “tabernacle” for Jesus, so she had to remain pure.
Mary is totally faithful, so the Church is called to total faithfulness and we are called to total faithfulness.
She brought forth Jesus to the world, so we are also called to bring forth Jesus into the world.
Mary was the first Christian, Jesus’s first disciple. So, she is the perfect example of how we are to follow Jesus.
She cooperated in the plan of redemption. The church also cooperates with God in the building of His kingdom.