“Is not this the carpenters son? Is not His mother called Mary, and His brethren, James and Joseph and Simon and Judas?”
Does this mean the same thing?
With all due respect, BenKenobi, if I were to say, "Here comes BenKenobi, with his mother, and his brothers Jim, Bob, and Ed," would you assume I meant anything other than your mom and those children to whom she also gave birth?
I understand that Jesus' brothers *could* have been Joseph's kids from a previous marriage, or *could* have been adopted. However, there's no evidence to support that. It seems that just common sense would indicate that the word 'brother' means just that - brother.
Now, I'll admit my near complete ignorance of Aramaic. It's possible that the word 'brother' could have a far broader cultural meaning in that language than it does in English, more like it does in Arabic. In that language, people will refer to each other as "my Muslim brother," "my Arab brother," etc, but there's always the modifier there to indicate that they do not mean a blood relation. When there's no modifier, and the context is that of family, brother means brother, not some more distant relation.