C.K.
Oh my goodness! I never remember my father giving me a cookie before dinner, but he loves to give them to my kids. We have been telling the kids (within hearing of their grandparents) that if they do a great job with dinner then nana or papa will give them a special treat after. Then everyone (grandparents included) know when the time for snacks are. I laugh when we get to my inlaws house and the kids take a candy that is right out on the counter, and then after they take their one, I put the candy jar in the cabinet and try to redirect the kids. It's tough. Thank goodness I have a good relationship with my inlaws. Good luck!