Question:

Where does it say that Salome was James and John's mother?


Answer:

"And many women who followed Jesus from Galilee, ministering to Him, were there looking on from afar, among whom were Mary Magdalene, Mary the mother of James and Joses, and the mother of Zebedee's sons" (Matthew 27:55-56).

"There were also women looking on from afar, among whom were Mary Magdalene, Mary the mother of James the Less and of Joses, and Salome, who also followed Him and ministered to Him when He was in Galilee, and many other women who came up with Him to Jerusalem" (Mark 15:40-41).

"Now there stood by the cross of Jesus His mother, and His mother's sister, Mary the wife of Clopas, and Mary Magdalene" (John 19:25).

  Mary, the mother of Jesus Mary, the mother of James and Joses Mary Magdalene Salome
Matthew 27:55-56   "Mary the mother of James and Joses" "Mary Magdelene" "the mother of Zebedee's sons"
Mark 15:40   "Mary, the mother of James the Less and of Joses "Mary Magdelene" "Salome"
John 19:25 "His mother" "Mary the wife of Clopas" "Mary Magdelene" "His mother's sister"

Notice that both Matthew and Mark mention three women who followed and ministered to Jesus while he was in Galilee. Because Matthew and Mark’s accounts mention Salome, the wife of Zebedee and the mother of James and John, but doesn’t mention Mary’s sister, and John’s account doesn’t mention Salome, some conclude that Salome was Mary’s sister, making James and John Jesus’ cousins.