We don't want to guilt them into changing. They have been like that since my husband was a kid. Everything else was more important than their kids. Even his Dad said they should have never had kids!! We accept that and even my kids don't expect much from them in regards to having a relationship and they will never "rank" in the minds of these people. Son just hoped this might have been the one thing his grandparents felt was important.
I think your idea of "ranking" is different than theirs. Seriously. Your son does rank with them, they're giving him $200.00. They can't give the emotional attachment, they aren't capable or don't want to, whichever. Doesn't matter - they don't give themselves. But they give the money, because that is what they can do. That's
their way.
I think Kwillia is right in saying if your son truly doesn't want the money, then dealing with this now & returning it will be a good thing. Otherwise, your son will continue to think there will be a new "one thing" that might be the one thing that they feel is important, and it will continue to hurt.
My brother is a very, very emotionally detached uncle to his 2 nephews and 3 nieces. He sends a generous amount of money faithfully every birthday, and Christmas to all 5. He also sends $$ to his grand niece & nephew - whom he has never met. He's not a hands-on uncle and he never will be. It bothers me, (used to bother me a LOT, but I've learned to deal) but that's HIM - not me.