Would you ask them to let you know before they go out on errands with your child? Would it matter to you the age of the child?

My son is 7 months old and his grandparents care for him everyday. I've asked them lightheartedly before to tell us before taking him places, and that's in their written directions. Yesterday they took him to Home Depot and the park without letting us know. I know it seems silly, but it bothers me a little bit because I like knowing where my child is during the day.

ETA: We pay them about half the cost of an in-home daycare. These trips always involve driving.