Just saw this now - so your sister cancelled the graduation party - how? By telephoning all the invitees and explaining that their son had been convicted in the Court of F8cebook? And that, because of whatever was revealed there, his achievements during his school years was no longer worth celebrating? PETTY and PATHETIC. The trouble is, the mind-dead drones are programmed to accept these 'punishments' as deserved and in typical Puritan fashion, if it means cancelling any reverie, so much more righteous do they feel!
Ok - so my 2c...not knowing your relationship with your sister, if it were me, I would bemoan and bewail the fact that I had bought the plane tickets, made all the arrangements to attend believing the invitation to be genuine and at utter disbelief in what I was hearing vis-a-vis cancellation. If there were a legitimate reason to cancel the party like illness or accident, ok - but this? This is ludicrous...
The longer I am away from DUBLAND, the more crazy a place it becomes...sorry to hear about this and hopefully your nephew sees the light that much quicker...