"curiosity - I've asked this question about five times and none of you have answered me: wouldn't you be pissed off if someone said they'd visit and then called that day to tell you they were too busy but that they'd call the following day and then didn't?"
In my post of 26-Dec-09 16:56:49, I believe the gist of what I was saying was that if the person was not in the habit of doing this I'd be more likely to be concerned about them and what was going on in their life to cause such uncharacteristic behaviour, rather than angry. And at no time in any of your posts have you said that he habitually lets people down.
And yes, as raised by other posters, why didn't you/your gran/your father ring your uncle to see if anything was amiss? Were none of you concerned about him, and thinking of all those normal reasons why people miss appointments?
And speaking of unanswered questions, perhaps you'd care to answer mine from that earlier post :
But perhaps you are more focused upon "He is the favoured son by a long way and is always happy to accept money from her etc."?
What did you mean by that? Because it bespeaks of deep and prolonged bitterness on your part, yet you have failed to back it up with any examples of behaviour on his part save this one incident. And I'd have thought some of the responses you've had would have prompted such examples by now.
If there is a history to your AIBU, then stop focussing on this incident and let it out because it's obviously festering. If there is no history, then you are the one with a problem not him.
I must admit I am inclined to think you have come on AIBU expecting lots of soothing noises and then got a little bit pissy because instead you got people looking at your incident calmly and rationally and daring to suggest your uncle is not the complete bastard that you demonstrably consider him to be.