Saint Damasus comissioned Saint Jerome to translate the whole Bible into Latin. Saint Jerome's version of the Holy Scriptures in Latin is the one that has been recited by all Catholic priests from his day (420) to ours. It took Saint Jerome fourteen years to make his first version in Latin of the Holy Scripture in what is known as the Vulgate.
He is the Doctor of the Church who beautifully let us know that Saint Cleophas was the brother of Saint Joseph. This explains why Saint James, Saint Simon and Saint Jude, the sons of Saint Cleophas, and Saint James the Greater and Saint John, his grandsons, are referred to as "the bretheren of Our Lord."
Ah, so this is the standard Catholic position? That the term used for "brother" could mean cousin, etc.? Jesus must have been an only child?