My mom, again... "you should get yourself some sandals, your feet are going to boil in these shoes!" While I was telling her that I have flat feet and need inside soles to correct my posture.
Again, she didn't believe me. Again, I had to show her.
I bought a cheap pair of sandals, and went to work (we worked at the same place for a short while). I looked at her without saying a thing. My shoulders weren't at the same height, neither were my hips, my head was to the side and my back made a sort of "S".
Was in pain all day, but for the look on her face: WORTH IT!
Stop trying to force people to do things, especially when it's medical! We know what we're doing for food's sake ><