I was wondering if you were going to think this. Life is in the middle, not at each extreme. Yes, your grandfather is crossing the line and yes, you need to set boundaries. There are people out there who will respect boundaries - bless their hearts, but there are just as many, if not more out there who will cross your boundaries. Learning how to stand up for yourself and set limits is healthy.

Children need to be taught this and if they are not, shame on those parents.

I would never leave my well being in someone else's hands. If a person doesn't set boundaries, this is exactly what they are doing.