That is not a proof of the existence of the mythical biological brothers even on its face. It is a rhetorical question, which only proves that Jesus had relatives close to him in age that might appear to an outsider as brothers.
Matthew 13:53-5753And when Jesus had finished these parables, he went away from there, 54 and coming to his hometown he taught them in their synagogue, so that they were astonished, and said, "Where did this man get this wisdom and these mighty works? 55 Is not this the carpenter’s son? Is not his mother called Mary? And are not his brothers James and Joseph and Simon and Judas? 56And are not all his sisters with us? Where then did this man get all these things?" 57And they took offense at him. But Jesus said to them, "A prophet is not without honor except in his hometown and in his own household."
These were not outsiders. This event happened in His own hometown.
REMINDER: All that is not of God burns. Catechism, Catholic tradition/teachings burn. Nothing left to stand on for the RCC pawns.
Catholic posts here are laughable and I believe meant to be laughed at. No one with an ounce of intelligence can take such nonsense as serious because it’s not meant to be serious. Deception knows no bounds.
Let's stick to your original claim which I refuted with Scripture.
She did not have any other children. "Brothers" of Christ are indeed mentioned, but, curious thing, every time a "brother" of Jesus is mentioned by name, his mother also is mentioned and she is not Mary.
MATTHEW - NAB
13:55 Is he not the carpenter's son? Is not his mother named Mary and his brothers James, Joseph, Simon, and Judas?
Brothers of Christ are listed and His mother is Mary
One thing at a time please.
1. Defend your claim.
2. Then divert to the standard Apologetics merry-go-round.