let's be real here, how many of these grandparents had their grandkids spend any time with them? modern 1st world culture dictates that living around your parents, or hell, even loving them, is abnormal and at most you're supposed to put on a polite performance for them whenever they come over and then sigh and whine and moan when they leave about how much you hated every second of it
you can complain about grandma being selfish when you've done all you could for HER, not sit there on your ass expecting the inheritance and then go "what? where is it?" idk where were you when she baked a pie and invited you over? bitching on facebook that you have to leave the house and see family? if so, fair enough, nobody's forcing you... but also stuff it, of course you get nothing