Note 11 at Acts 12:14: It is most probable that the reason Peter chose to come to the house of Mary was because it was a common gathering place of the Christians. It is certain that Peter was a regular guest at Mary's house because the maid recognized his voice (v. 14).

Peter also spoke of Mark as being his son in 1 Peter 5:13. This is not speaking of Mark as his physical son, but a spiritual son, the way Paul spoke of Timothy (1 Tim. 1:2). Therefore, it has been supposed that Peter was the one who led John Mark, and possibly his mother Mary, to faith in Jesus .