My six-year-old granddaughter is terrible about helping her sister put up toys. She always has been. Before my daughter died, she was trying hard to get her to obey without all the drama, and the child stayed grounded most of the time. Also, she acts like she doesn't hear adults most of the time. I only have them for a weekend about once a month, along with their two year old brother. It's very exhausting. How should I handle this?