I understand about sore feet because I get them too from standing when I used to stand for my job. I used to wear Hanes Alive support pantyhose. They helped some but not completely.
Glad to hear that your H is bing supportive regarding your S and his friend.
I like your strategy of not doing the kids' chores for them. They are probably hoping you would do them. They have to learn. I know when I was a teenager, I didn't like doing chores either, but I did do whatever I had to do.