Indulging your grandchild

I have now read many other blogs and opinions on grandparenting. Many grandparents feel that babysitting is a chance to “indulge” their grandchildren and let them get away with behavior (certain foods), etc., that they can’t with their parents. I feel it is important to reinforce the behaviors and schedule that my daughter has put into place. I babysit several times a week, so my experience may be different than grandparents who visit occasionally, but I would love to hear feedback from other grandparents,and parents.