Aw, my grandparents had it as well. One had the "nice" kind, where they just happily live in the past for years, and never get too upset over their confusion - they just don't know who you are. My grandma had the "bad" kind where she had horrible delusions and saw witches and stuff. It's hard either way.

There is a REALLY good documentary series on HBO right now if you have it, and part of it is about caregivers and stuff and you can see how people deal with it. I recommend the whole series for anyone who has or is going through living with someone with the disease.