>Don't discuss those things.
I don't think that's a good solution, you just expect someone to shut up about things that are important to them? I don't think that you can consider that a good familial relationship if you have to censor yourself about the things you feel strongly about. You should be able to discuss these things with mutual respect even if you don't agree with the other person's opinion.
Rather than dealing with the problem directly your solution is to ignore the issue completely.