Joann, after my father's first surgery (12/06), he did the initial rounds of radiation and chemo and started the follow-up chemo with Temodar. But it made him so ill that he didn't want to continue, so he stopped taking Temodar.
He felt reasonably well for about 6 months, when seizures began, followed by recurrence of the tumor growth. He agreed to go back on Temodar then, but it didn't help. Tumor continued growing rapidly and he had another surgery in March. He says that's it, no more intervention, but he's still on anti-seizure medication and a couple of other meds also.
Similar situation, I think--he definitely does not want heroic interventions if they will make what remains of his life miserable. But it is very difficult to partake of just a *little* of modern medical care. Anything he agrees to do seems to be a slippery slope toward more and more attempts at treatment, intervention, medication, procedures, etc.
I'm so sorry that you and your dad are going through this. My dad is about the same age as yours, too; he's 67 and like yours had never been sick before this came along. Good luck to both of you.