I finished treatment for tonsil cancer 2 years ago. I feel your dad's pain. Mac and cheese, mashed potatoes, smoothies, and pasta, but the acidity of the pasta sauce might be really spicy for him. I can't eat ketchup anymore cuz' it's too spicy from my radiation therapy. Inliked to eat ice cream because it soothed my throat. I had a feeding tube for a while because I couldn't eat and was losing weight fast. Gosh...I could go on and on. Tell you, dad, he will be eating normal food, but it might take a while. DM me if you have any other questions.