DH's sister and her partner always upset me by the personal comments and questions they make to me when we see them. They have the knack of digging exactly where I am most sensitive. I avoid them whenever I can, but she is DH's only relative so can't go completely NC. I get so tense and wound up whenever we have to meet up with them and DH is no good at all at supporting me. Would IBU to hit back with some of my own? What can I say?