Poor you! Even my MIL tries to make us as comfortable as she can when we're there--and at 88, her routine is pretty much set in stone. Since you're kinda stuck there now, please at least speak up about the A/C. That sounds unbearable. And yes, do tell her your DS can't eat so late at night. Better yet, get DH to say something. I wouldn't let my husband get away with not being an intermediary in this situation. You will resent him, I'm afraid--and it wouldn't hurt to tell him that, either! Say something to him. You're an extremely tactful person. I'm sure you can do it in a way that won't cause an argument--like "Honey, this heat is really getting to me. Could you please say something to your Mom--or turn up the A/C yourself?" And so on.