Absolutely false! In Hebrew/Aramaic as well as in Greek, but also in Serbian and other languages of that region (to this day) they could be called His brothers if they were only His half-brothers, or first cousins.
I believe A8 already made this disticntion. But they are never identified as "Mary children," as Christ is undoubtedly identified as "Mary's Son."
It is a rare thing to watch someone to repeat the false statement thoroughly refuted on this very thread another time as if it is just occurring to him.
You need to look at Rom. 16:21. Paul uses suggenes to refer to his relatives just like Luke did in referring to Elizabeth as Mary's cousin, not adelphos, and in verse 23 he uses adelphos to refer to a fellow member (a brother, not my brother)of the church. You can't prove that Jesus brothers were not Mary's children except by dogma.