This Grandmother was banned from seeing her grandkids after the child's father discovered she had been shaming their ten-year-old about her weight. The thread was posted to Reddit's r/AITA (Am I the A-Hole) subreddit by the father, u/Superduppppy. We were recently discussing the “benevolent grandparent” and how it's easy, for those who were fortunate to have them, to assume that that's just how all grandparents are. It's always saddening to see stories such as this, where a grandchild is being…