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.
There’s a special providence in the fall of a sparrow. If it be now, ’tis not to come. If it be not to come, it will be now. If it be not now, yet it will come—the readiness is all. - Hamlet, Act 5, sc 2