The man was an elderly man with poor health and probably a bit reclusive. If they wanted him at the wedding, why not go and see the man during the courtship? They were flying around like crazy so another air trip would hardly have been that difficult for them. Sending him an airline ticket was hardly courteous.
He stopped being reclusive in a hurry when approached by the media. I would have liked to have someone send ME an airline ticket if I were invited to my relative's wedding in another country. I saw nothing wrong with that at all. They even paid for and arranged to have him picked up by limo. He seems healthy enough to be active in arranging TV specials and interviews.