Just imagine how tough a child's life will be if everyone they interact with try to control them and won't let them be children.
Grandparents are there to maintain a balance between both the worlds. It is a fact that grandparents are not burdened with responsibility of raising a child. Even in some instances when they have the full responsibility, grandparents are soft on kids.
May be it their years of experience raising their own children. Or they regret some of their parenting methods and are trying to make up for it by going soft on their grandchildren.
Whatever the reason, there is no denying that kids need the soft handling of grandparents. They really need someone to turn to when the chips are down.
Parents should not grudge this privilege enjoyed by grandparents, as one day they will be grandparents and spoil the brats as much as they want!