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.
"Tell your heart that the fear of suffering is worse than the suffering itself... And that no heart has ever suffered when it goes in search of its dreams, because every second of the search is a second's encounter with God and with eternity." - Paulo Coelho