Hey peeps my grandfather is very ill and has advanced stage dimentia. I was hoping to medicate him. Researchers have shown cannabis to actually slow down the progression of the disease and regenerate healthy brain cells.
"Dementia", and I see a number of potentially serious problems with your premise.
First of all, dementia is a clinical syndrome, there multiple different kinds/causes, and they may not all respond to the same treatment. What KIND of dementia does your grandfather have? Alzheimers? Multiple infarct dementia? Unknown?
While I don't doubt that cannabis could potentially help with some of the symptoms of dementia (eg agitation, spasticity, etc) I'm fairly skeptical about claims that its going to regenerate brain cells or meaningfully alter the course of the disease. So far as I know there is zero clinical evidence that cannabis therapy alters the course of dementia in human beings.
Evidence of efficacy aside, lets get down to brass tacks. What exactly is your plan here? You're going to teach gran-dad to smoke weed?
Is he even willing to do that? How about physically able to do it safely and consistently? Is there a physical place where he can do it safely? Does he have a card? Do YOU have a card? Are your parents OK with this? How about your GD's doctors and/or other caretakers?
If these things aren't true, you're probably done before you started. Not only can you potentially hurt your GF here, but if everyone isn't on board with you, you could potentially get yourself AND your grandfather into a gigantic heap of trouble. If you're thinking about the equivalent of dosing your GD with pot brownies without anyone's knowledge, that's not just a "little" bit irresponsible, but highly illegal, and potentially dangerous, too.
DO NOT do this.
Yes, cannabis is "non-toxic", but that doesn't mean its "harmless" or without side effects. One typical side effect of cannabis therapy is tachycardia (rapid heartbeat) and to someone with heart or cardiovascular issues, this could cause SERIOUS problems. Anxiety is another potential side effect, and again, in someone already prone to it (eg someone with dementia) that could also be problematic. Smoking anything is potentially going to cause respiratory issues, and in an older demented person, these could be devastating.
Since you didn't mention what OTHER conditions your grandfather might have other than dementia (eg does he have cardiovascular disease or arrythmia? How about pulmonary issues?) that's another good reason not to just proceed. There really is potential to do harm with this, and I don't think you, your GrFa, or anyone else would be very happy if your intended therapy triggered a trip to the hospital, or worse.
Does anyone have a strain recommendation.
Here's where I'd say cite the studies you think support this proposed therapy. If you can't do that, maybe you need to do a little more homework here, first.
The real issue is, which cannabinoid(s) are supposedly providing the benefit here? If its just THC, then any THC rich strain would work. If its CBD, then you'll want one of the purpose bred CBD strains, like harlequin, cannatonic, sour Tsunami, etc.
Assuming you are actually in a position to proceed here, depending on how "with it" your grandfather is, and which symptom(s) you're trying to address, you might just try different things to see empirically which works best. As a general rule, you'd want to start with absolutely MINIMAL dosing, and SLOWLY work your way up.
But again, I don't think that's possible or practical unless a number of others are on board with you. Assuming you are in a place where what you propose is legal, consultation with your GF's physician would be smart.