This is all true?
You gave your father a kidney and he continues to eat such a destructive diet? I don't know what more you could give. I hope he's been grateful. You may be his son, but most kids don't give that much back. And your mom getting mad at you for cooking your own food outside is crazy.
The divide between vegans/vegetarians and others seems to me to be largely an issue of drawing lines too harshly. If they just made slight changes in their diet, that would be something to praise. People always assume vegans are on the verge of beginning to preach black and white rules and shriek about poor dying animals. Just adding one more vegetable a week, or one less serving of bacon, is enough to start. Maybe you can find some dishes that are both healthy and enjoyable for everyone there.
Yes it's true and I agree with you. I would be immensely relieved if they would at least improve a little. It's like they are programmed to self-terminate. Thanks for the well-written comment @unstitched