Cheryl has stated it very well and I agree very strongly with her.
This is a quality of life decision. If this was my Parent or my Husband I would be going down the palliative care route. Treatment is brutal and in someone who already has major health issues which will be compromised and indeed will cause limitations on treatment, I would not treat.
Thinking of your Family in this difficult time,
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!