Within the Trinity, only the second Person of the Trinity became man. But the second Person of the Trinity always acts in union with the Father and the Holy Spirit. Jesus was an only child, but he lived in the unit of the Holy Family. On the Cross, Jesus' death alone redeemed mankind, but he was crucified with two others. So, while Jesus is the sole mediator between God and man, we might look for two co-redeemers. And they would be Mary, who stood...