Another lesson that I'm beginning to learn and understand slowly:
Those who grumble most are those who have been blest most!! It is only those to whom much has been given, will want more. Those who have something or little will go about life in a contented way. You give them little more and they'll treasure it. You give them something more again and again, then they will start grumbling about it sooner or later.
That's another of the lesson of the Parents' day!