https://store.catholicproductions.com/blogs/blog/the-brothers-of-jesus-a-fresh-look-at-the-evidence
In this video, Dr. Brant Pitre discusses the so-called brethren of Jesus, and asks the fundamental question as to whether or not -- given both the biblical evidence and the early Church fathers -- the gospels speak of biological brothers of Jesus or not. He will also explain who these so called brothers were and the positions they held in the early Church.