From Ask Amy, Grandma is concerned about her grandchildren because her more-than-likely soon-to-be-ex-daughter-in-law "lines them up in front of their father and tells them what's wrong with him. She tells them that their father doesn't love them."
Newsflash to Mom: This is a strategy bound to backfire. And Grandma should know that her best strategy is to hug the grandkids, shower them with love, and reassure them that their father loves them more than anything. Oh, and warm chocolate chip cookies can't hurt either.