Help us fly to my dad

My dad has had lung cancer for a few years now, but we didn’t understand the extent of his problems until a few days ago, when we were informed that he’s doing very poorly. He is currently in hospital at MD Anderson in Houston, Texas, and his doctors have recommended that we fly to spend a couple of days with him. I don’t have the money to pay for hotel and flights so last minute, and my mom’s just paid for our flights and hotel to Oklahoma in a few weeks on top of paying for hers, mine, and my sister’s costs to Texas. I’m asking for $500 to help cover my airfare round trip so my mom won’t have to worry about my cost, at least. Any amount of money can and will help. I know this is a lot to ask in just a short amount of time, so thank you guys so much for your help and consideration ❤️