This strikes me as being more of the goofy, unsubstantiated “Holy Blood, Holy Grail” nonsense. No thanks, I left the keys to my UFO on Zeta Reticuli, pecifically so I could get away from intergalactic nonsense.
Jesus blood line: God-Jesus. (please not the period at the end of the blood line.
I don't see why, this is not some silliness about descendants of Jesus, but is a consideration of the likely existence of descendants of his cousins. Jesus is a human being with relatives whose descendants could still exist, as much as he is God.