I thank God every day for my parents. When our 1st son was born, my mother said, "There is no way that boy is going to day care. You bring him right here!" My mom and dad have watched my kids from day one. They pick them up from school every day. My mom taught my kids so much while I was at work that they entered school way above grade level. My mom helps them with their homework every day.
Without my parent's help, there would be no way that both DH and I would have been able to work. The day care costs would have been more than DH makes. I hope that you grandparents who are helping with your grandchildren know how truly "grand" you are.