Hi Jordan,
People with AD can sometimes become onrey, biligerant, and abusive. Even if they weren't like that before AD. That is where I draw the line. You cannot let someone be mean or abusive to you or others. They are like small children who are scared, or just want their way about things. At times, they have to be treated like small children. I don't know if you can curb your Grandfathers actions or not but you can say, if your going to be that way, we are going to leave, and leave, even if it is just to a separate room or outside.
My Mom continually trashes my sister in law. I am so sick of it. It is a manifestation of years of them not getting along very well but my sister in law hasn't done anything to deserve this kind of trashing. I finally told my Mom when she started in again that I did not want to hear or talk about her any more. I had to say it several times but she finally stopped. I'm sure I will have to say it again. When she gets a bee in her bonnet about other things I just have to say "no". Children nor AD sufferers like to hear "no", too bad. So the bottom line is, be patient, be caring, be concerning but don't let the AD Grandpa verbally abuse you or your Grandma. As Super Nannie says, " that isn't acceptable !"
Debbie