I could imagine vegans being upset if you weren’t vegan solely because your wife and kids can’t be (like they are a shield or something, idk). Modern veganism should be about harm reduction. I know someone mentioned beans but I think seitan has more protein per punch (has more than steak according to a random google, *forgot about the carb limit tho, it looks like it wouldn’t go over too much but depends on the source). I don’t have much experience with your family’s conditions. I need a bunch of fiber or else I get severely constipated, I was shocked at how little your wife gets. Sorry you got hate for your wife and kids. It sounds like your wife was (is?) in a bad spot, I hope her recovery gets better.
*edit
One letter off from greatness 😮💨