Interesting conversation w/your wife. She's in a relationship, but she doesn't want you to be in one. Sounds to me like she wants to ensure that you are right where she left you...but unfortunately, that is not going to happen. How would the children be in danger?
I see she is still not looking within and blaming you for whatever the "bad stuff" is. Projection.
I am glad that you are still planning to take the children to see their grandparents. I'm sure they are already questioning everything she's doing...but she doesn't want them to know everything because she knows that they are watching her and most likely attempting to talk to her about it.
I'm glad Christmas was good otherwise. You sound like you've found your footing and know what you need to do. I hope that the rest of the holiday season will good for you and your children.
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.