That was a quick turn around from being divorced to remarrying before the ink was completely dry. Maybe they are keeping it secret because they don't want to hear any flack from others. Maybe your son knows about it or suspects something and this could be playing on his mind. Whatever the reason for the secret, I'm glad you aren't saying anything about it.
I'm so glad that you and your son are doing so much better. I do hope things go smoothly and he has a good year at school. Remember, before you speak from anger or frustration, count to ten and then decide if it's worth it to blow your stack.
Enjoy the holiday!
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.