I became vegetarian while I was still in high school. My mom was really good about it - she made sure I knew what I was talking about in regards to protein, and saved back food for me before she added the meat to whatever we were having. She's never minded modifying food for my (sometimes odd) food aversions, as long as it wasn't difficult.
My ex and ex-MIL used to sneak meat into my food, so that was disgusting.
My partner and I aren't vegan, but we don't eat eggs or dairy, so it's become a little more difficult to visit people than when I just didn't eat meat. Usually we take something with us when we visit his family, and we do the cooking when we visit mine. We eat beforehand when we go to visit friends because there's generally nothing to eat.
If we were to have people over, we would serve them vegan food that is omni-friendly (no vegan cheese or seitan, plenty of calories so they feel full). My mother stayed with us for a week last year, and we had some non-vegan food for her - she probably would have gotten sick with such a sudden change and the drop in caloric intake. But she still ate lots of vegan food, and thought it was good.
life's not a paragraph
and death i think is no paranthesis