I have no desire to let them babysit just to make them happy,
Let me get on a soapbox here for a moment, because this is a big one for my. My ex-ILs treated children like belongings. If grandma wanted to hold the baby, grandma was going to hold the baby, even if the baby screamed bloody murder because he was at that particular point of his development in a phase of stranger anxiety.
We're supposed to prioritize the needs of the children. Not the needs of the grandparents. They're supposed to be adults and understand that children are little people with needs that are more important.