EmmyG....I echo what the others have said about letting the kids have their time with loving grandparents! I think the vacation time with their grandparents would be a great source of joy and comfort in their lives. This is the kind of adventure that they will remember, fondly, when they are 40yrs. old!!!!!!!!!!!!! Would you reconsider? It is none of their father's business....the way I see it. As long as they are safe and haven't been taken too far away. You are entitled to make these decisions as much as he is...probably, better!!
Please stay away from him....for the reasons that Hawkeye just pointed out.
This man is not your boss;he is not your superior.
dandylion