Can you provide a scriptural reference of the Apostle John being the Lord's cousin, because I am not aware of one.
Didn't post #704 do it for you? It showed "Salome" at the crucifixion identified by [Mark 15:40]. It showed "Salome" as the sister of Mary [John 19:25] and showed "Salome" to be the mother of Zebedee's children [Matthew 27:56]. Finally it showed Zebedee to be the father of John and James [Matthew 4:21]. Deductive reasoning would tell us that "Salome" is the aunt of Jesus, "Zebedee"....an uncle and James and John, the "Sons of Thunder" [Mark 3:17] were first cousins of Our Lord.