Parents' love for their children is dignified and strict. They are facing the competition of this society and their own hardships, so they know better than their ancestors what their children will face in the future. The requirements for children are naturally different, and grandparents have long been divorced from society because of their age. Usually, they can't judge the harshness of the future society, so they don't ask too much of their children. At the same time, the relationship between grandparents and grandchildren is often biased towards grandchildren, and children are in this relationship.