Of course you are angry. But it's a very difficult situation - been there, done that. One thing to remember is that the kids are still too young to consider that their mother might be manipulating them - they can't really question the primary caregiver's motivations until they are 11/12. Things might be different then - I would think that DSDs motivation for staying is very real - son might be sad.
It is true that it's hard to take a week off summer school. I would say that the best you could hope for is a make up week later on, and no family trip with them.
It is true that it's hard to take a week off summer school. I would say that the best you could hope for is a make up week later on, and no family trip with them.