As the kids grow older, he’ll wonder why the kids want to spend more time with their grand parents than their parents.
We're blessed that our two grandchildren are less than an hour away from us. My 10 YO grandson goes to the same elementary school our 3 kids went to.
Of course, he loves spending time with us...I have a sign on my door that says, "What happens at Opa's, stays at Opa's."