How did Grandma Moore treat Cousin Dotty in comparison to the way she treated Charlie?

Upon moving in with Grandma Moore, Mary realized a stark difference in the way her grandmother treated Charlie to the way she treated her niece, Dotty. Mary noticed that Grandma Moore was quick to compliment Dotty on her life and relationship choices, while staring pointedly at Charlie as if to say that Charlie had made all the wrong decisions. Mary watched as Charlie withdrew from her mother and eventually took the girls and moved back home.