Bucket List Wish

My step father who is a wonderful man, he spent more than 40 years help saving people lives and delivery babies as a RN/Midwife. Ironically, in his final years he is diagnosed with terminal health himself and nobody can help saving him. He has final stage cancer now with counting days left and no treatments available anymore, and his wish is to go on the Gain travel Australia. Unfortunately, the Gain themselves can't accept companion card, and my step father can't travel by himself. Also the only suitable option they give him, who travel in wheel chair and with oxygen tanks is at least Premium which is around $7000/person. So if he wants to come with his wife and a carer to help with we looking at something like 21,000, way out of our hand. If anyone have a spare small money to help us, that's mean alot. Thank you