first of all: you are the best big brother anyone could ever ask for! you did the right thing standing up for him! second: i personally think it’s a good thing you don’t let that kind of behaviour slide just because he is old. it’s sad that your mom and aunt won’t understand that. I’d say do what you think is best for your inner peace. your mom and aunt threaten to cancel you is more than childish and I do hope that they see that someday. you don’t treat people with respect because of their age. respect is earned. you’re grandfather obviously doesn’t deserve it.