James the cousin you mean, unless you are confused and think that the Bible was written by King James?
Nope. James. The brother of Yashua. Matthew 13:55 - doesn’t say cousin. Says brother. Not brother in Christ, but brother. Also mentions His sisters.
Did I miss the author explaining away the Latin Vulgate? Must have missed that. Seems St. Jerome understood 'brother' meant 'brother':
Mark 6:3:
nonne iste est faber filius Mariae frater Iacobi et Ioseph et Iudae et Simonis nonne et sorores eius hic nobiscum sunt et scandalizabantur in illo
Of course if 'cousin' or 'kin' was to be exact Jerome had the following to choose from:
patruelis, -is, m./f. paternal cousin
sobrinus, -i, m. maternal boy cousin
sobrina, -ae, f. maternal girl cousin
But Jerome did not.