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We're thinking as the very precise Koine says that the members of His own synagogue who knew the whole family thought and remarked with amazement: "Is not this the carpenter's son? is not his mother called Mary? and his brethren, James, and
Joses, and Simon, and Judas? And his sisters, are they not all with us? Whence then
has this man all these things? " (Mt. 13:55,56 AV).

"Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him" (Mk. 6:3 AV)

Same as in DRB. Your rationalization of these passages didn't come from your own thoughts. It came from someone else's, didn't it, eh? This wild conjecture had to be manufactured, because the Holy Scripture from God proves that the false extra-biblical teaching of perpetual virginity crumbles under its own weight when faced with eyewitnesses who say otherwise.