But some suspect the brethren of the Lord to be sons of Joseph by another wife, following the idle fancies of apocryphal writers, who have coined a certain woman called Esca. But we understand by the brethren of the Lord, not the sons of Joseph, but cousins of the Saviour, sons of a sister of Mary, [margin note: Mark 6:3] an aunt of Our Lord, who is said to be the mother of James the Less, and Joseph, and Jude, whom in another place of the Gospel we find called the brethren of the Lord. And that cousins are called brethren, appears from every part of Scripture.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hieron. in loc.