I would contact your wife, closer to Christmas, and advise her that your child is asking to see her at Christmas. Put the ball in her court and give her the option of saying yes or no. You will know what to do when you get a response from her.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
