I have had some similar but in no way identical issues in my own family. I tried everything I could think of but came up against a wall of pre-conceived notions I wasn't able to alter. A lot of heartache followed and I found it extremely hard to rise above it. In the end, that's all I could do. Others think and do what makes sense to them. A very difficult lesson for me to learn. I ended up doing my best. No one can ever take that away from me.
I hope someone else has a more positive spin on your situation. That's what I love about our forum. In the meantime, I am sending you good wishes and hugs.