Oh Linda, this is such a sad story. You have obviously tried very hard to help your Brother. It sounds like his tumour is now so extensive that there is no treatment available for a cure.
Hospice is for end of life care. Their job is to provide physical care and ease the patients suffering with adequate pain meds.
I would ask them about getting a PEG inserted into his abdomen as a means of both feeding and hydrating him.
I'm guessing that he has head pain from the huge size of the tumour pressing on structures in the head and on nerves.
As I'm not from the USA I can't comment further on your Hospice system. However I would want to sit down with one of the Docs and a Nurse involved in his care and discuss exactly what they know about Jimmy's cancer, it's spread and what is likely to happen next. Also what they plan and have to offer to you all.
Thinking of you all,
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!