It sounds like you all are doing the right things. I was about 5 weeks into treatment before I "hit the wall." then it was all through the tube. As far as eating, NEVER EVER GIVE UP!!! And,,,, don't let a doctor make you think that way! I eat steak, chicken, bread, etc., and was told the same thing. It took a long time to get to that point (And I'm stubborn I guess) but it's about learning how, being patient, small bites and lots of water, and desire to succeed. Some meals take a really loooong time but it's all about striving to be "Normal" (Whatever that word means-LOL).
Best of Luck. Your Father will get through it with your help!
Steve

SCC right side BOT/FOM; DX 1-25-06; Neck dissection/25% of tongue removed 2-17-06. Stage 2 Recurrence 7-06: IMRTX35 & 3X Cisplatin ended 10-18-06. Tumor found 03/18/13; Partial Glossectomy 03/28/13 left lateral tongue. Nov. 2014; headaches,lump on left side of throat. Radical Neck Dissection 12-17-14; Tumor into nerves/jugular; Surgery successful, IMRTX30 & 7X Erbotux. Scan 06-03-15; NED! 06-02-16; Mets to left Humerus bone and lesion on lungs-here We go again! Never, Ever Give Up!

**** PASSED AWAY 10/8/16 ****