Family doesn't deserve any more love or respect than anyone else. My mom is ok but that isn't to say we get along about everything or that I need to agree or give her respect about everything.
My grandfather beat my mother's head into the wall everyday while she was growing up and she still goes on about how she is supposed to have love for him because "he's family." My mom stayed in a very unhappy relationship with my father because of the same traditional garbage. She ended up being the one to lose in all this because of her "loving" nature. I guess because old Italy teaches women garbage like "love is unconditional." Just to clarify, love IS conditional and anyone who thinks otherwise obviously has little to no self respect or has any idea what love means for that matter. Love should be formed under the basis that the other person doesn't beat you, steal from you until you're destitute, and most importantly, does not abuse the love you give them. If love means ANYTHING to you, it should damn well be conditional. To make it unconditional is to not even understand the preciousness of love in the first place.
The whole idea of putting your family ahead of others just because they are family is garbage and quite dangerous. My grandfather is a wife beating asshole and the day he dies will just be the day a scumbag leaves the earth. And I don't give two fucks that "he's family". If you beat your wife and kids you're a piece of shit in my book, whether you're related to me or not.
Have you told your grandfather what you think of him? If not, do it, let him hear what a fucking loser he is.