Legends tell us that Joseph of Arimathea brought Solomon's Bowl to the Last Super with Jesus and his disciples. Joseph then brought it to the crucifixion and used it, and a set of vials, to capture the blood and water that flowed from Christ's side. Joseph and Longinus also helped take down the body of Jesus to clean and prepare it for burial. Longinus and Joseph became very close and worked together later in their ministry to spread the truth of "The Way" of Christ's life, even to far away England.
Thus, Solomon's Bowl, the vials of water and blood, the spear-head of Longinus, the sponges used during the crucifixion, pieces of the holy cross, the holy nails, the veil of Veronica, the burial linens, and numerous other "blood relics" were gathered by the seekers of "The Way" and given to Jesus' Mother and Mary Magdalene. The alabaster vials that held the oils used on the feet of Jesus were also considered holy and were preserved. All of these "holy blood relics" (grails) were protected by the soldiers of Christ while revered and worshiped by the women who became the first grail maidens and keepers of the holy blood relics.
Just as Gabriel holds the grail lily as a representation of the female blood mysteries of birth and the moon, so, too, Mary Magdalene was seen by some as the wife of Jesus and the mother of his children. There are numerous legends concerning these ideas and different stories say they had either three male children, two male children, or one female child. The male children are often confused with the children of Joseph of Arimathea and Longinus who end up being the founders of the Arthurian grail stories in England where Joseph and Longinus established the first church in Christendom at Glastonbury.
The female child of Jesus and Mary Magdalene was named Sarah, the wondrous child, who legend claims was the founder of the Merovingian line of monarchs in France. Much attention has been focused on this child in books and movies suggesting that the holy blood line of Jesus and Mary Magdalene continues to this day. There are a great deal of legends concerning the children of Jesus of Nazareth.
Even though legends and traditions exist, to carry the "blood mysteries" into a "blood line" is somewhat speculative. But many believe that it is a given that Jesus, "the Rabbi", had to have been married because it was a prerequisite to being a rabbi. Mary Magdalene, the one the Lord loved, is certainly the best suggestion seeing that Jesus seemed to be the closest with her and she was truly the most faithful follower. It also seems common sense that the Mother of Jesus and Mary Magdalene would cherish and hold any blood relics of Jesus. To add a child to the blood mysteries, opens the scope of why the women seemed most faithful and devoted to the instructions and teachings of Jesus. Surely, the first Christian community surrounding the Mother of Jesus would have held all the blood relics as sacred, especially if Jesus had offspring.