yeah - that stinks! but from what i've read in your other posts, your kids will both notice your absence and miss you significantly. it sounds like you have a very good relationship with your son and that he loves you a lot. i know that doesn't make the hurt about being excluded any less. but it is much more important. to both of you. i had lots of family birthday parties - but after age 3 i never had a loving father. i hope you can cherish what you do have - even though it is not what you wish you had - or what you deserve.
"That you are here - that life exists, and identity; that the powerful play goes on and you may contribute a verse. . . What will your verse be?" Robin Williams as John Keating in "Dead Poets Society"