[wmfights]

"Some Protestants refuse to accept the fact that in the Mediterranean and Balkan cultures the term "brothers" and "sister" is used for first cousins."
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If you don't agree with the Scriptural references, how about your early church fathers. Origen discounts the claim of Mary's perpetual virginity in his "Origen Commentary on the Gospel of Matthew, ch. XVII.

Other sources outside of Scripture would be Pliny the Younger referring to "James, the brother of Jesus" and Joesephus's "Jewish Antiquities" refers to James in Jerusalem the brother of Jesus.

[kosta50]

Joesephus's "Jewish Antiquities" refers to James in Jerusalem the brother of Jesus

The Hebrew word "ach" (akh) means brothe rof the same parents, or one of the parent, kin, etc. There is no deifnite meaning to it that implies both parents. You will have to dig up a verse that plainly sayas "Mary's son James" to claim that she had other children.