If I were in your position I would be bummed and feeling left out. Try and use this time to detach from the negative emotions.
When you do have contact, present an upbeat, confident, almost happy, to happy demeanor. It is important to “act as if” while contacting them. Your kids need the break in the drama the vacation will give them. W does not need the satisfaction of your sadness over not being there with the kids.
BITS Me 55, ACK, when did that happen? Doesn't feel like 55 D 30 S 27
You create your own universe as you go along - Winston Churchill