Adam Clarke on Mark 10:35

And James and John - come unto him - The request here mentioned, Matthew says, Mat 20:20, was made by Salome their mother; the two places may be easily reconciled thus: - The mother introduced them, and made the request as if from herself; Jesus knowing whence it had come, immediately addressed himself to James and John, who were standing by; and the mother is no farther concerned in the business. See the note on Mat 20:20.