Do what feels right for you. If you feel like (for lack of better term sorry
) the third wheel on the pending vacation then you should stay home. You could do something nice for them while they are gone, or just pamper yourself, or just enjoy yourself alone.
We haven't taken any real vacations with our OSO's, but we spend almost every weekend toghether with all of our kids. We have been out to do alot of things toghether as an extended family.
We would go on vacation together more if it wasn't so hard to make room for the NINE of us to go places.