Thats total crap to begin with. Some people just dont have any family values. I laugh in the face of anyone who wants their grandma to just "shut the fuck up" when they're just talking to you and not just nagging.
Stop with your bullshit "conforming to society" nonsense and grow the fuck up. Just because you have a fucked up family doesnt mean everyone else does.
Well the only solution here is for you to learn sign language, and when she starts going off in Russian, you start hand jiving in sign. The trick is, you need to look flustered over your grandmothers lack of understanding sign for this to work.
damn dudes, i have the same problems some times. now that im older my grand mom lets me know she knows im not really listening. she keeps shit so bottled up that it sucks but, she (as most grandmoms) wont listen to a damn thing you say hahaha. i kind of wish my family had better stories, things i could learn a lot from. my grand father is basically deaf and blind, so he doesnt talk much ahaha. neither of my grand parents did anything cool, they didnt even have it rough during the depression.