i got frustrated a lot, i have made progress with mum but i am giving it a break.
They are conditioned/brainwashed to thinking nothing, the answers come to their head from magazines, evidence and proof they think they've seen from books and stuff is actually just what the society want to stick in their heads.
in helping people we HAVE to want to help them and not just prove them wrong and more importantly stress to them that you want to discuss and help and not necessarily prove a point and that you too will have an open mind. your in no threat of being proven wrong and they can feel comfortable too.