Welcome to the board and sorry for the reason you're here. As you will no doubt hear over and again, get your dad to eat everything he can now. All the stuff he loves, shovel it in. After a couple of weeks, he probably will not be able to handle solid food at all. Keep him taking liquids by mouth as much as possible, otherwise the swallowing muscles forget how and he'll need to go to therapy for that. He will also have a very dry mouth. Get some Biotene mouthwash, toothepaste and mdry mouth gel. There will be othwers weighing in with more advice and to answer any other questions you have so ask away and there will be someone to answer. Stay by him and support him as much as you can. Good luck.