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5. "My kids love your kids."
Parents have finely honed B.S.-detectors, so there is no sense in lobbing out an "I love your outfit!" at a woman wearing yoga pants and the nutritious half of her child's lunch. But telling a mother that your kids love her kids is one of those wonderful sneaky compliments disguised as a fact—a fact she can feel glowy about. There is, snuck in there, praise for her parenting, love for her children and a promise of friendship.