If Mary had several children of varying ages and her Husband died leaving her that many mouths to feed, the natural course of action in that day and even in America, until recently, would be to send children to live as adoptees with close relatives, allowing the Mother to concentrate on raising the youngest, the little ones still in her care. But of course that would not fit your assumptions, so you would naturally discard such a reasonable explanation. But that explanation makes what Paul wrote (James the Brother of Jesus) no error on his part or any error in 'translation'.
Read Tim Staples’s BEHOLD YOUR MOTHER.
Far more profitable than unsourced, baseless, niggling tit-for-tat exchanges on the internet. He deals with just about all the relevant Scriptures, all in one book.
Also more profitable than telling me how intellectually dishonest you just know I am.