Sorry to hear that about your grandmother. It's an incredably difficult situation. I was lucky, my grandfather died quickly in his sleep. That's how I want to go. So, yes, I want a DNR.
That being said, I can certainly sympathize with people who want to fight for every last precious moment.
If I can get up on the soapbox for a minute, this is why I have such a problem with people who say that letting a terminally ill person die is "playing God". We started playing God when they were treated, put in the ventilator, did any of the countless medical procedures to extend their life. Don't tell me about playing God. Tell me that you love that person, and that you want to get as much possible time with them, that you're willing to hope against hope for recovery. That's why you're fighting for them.

Sorry. Off soapbox, end of rant.

__________________
“Sometimes I think we're alone. Sometimes I think we're not. In either case, the thought is staggering.” - Buckminster Fuller

"A man talking sense to himself is no madder than a man talking nonsense not to himself." - Guildenstern, “Rosencrantz and Guildenstern are Dead”