Grandparents being close is a blessing. Growing up mine were in bike distance from our house and my parents had to drag me home from their house every night of the week. They gave up on weekends. I spent so much time there I had my own room. Grandfather had all the time in the world to keep me out of trouble either hunting, fishing or taking me to college football games. You are lucky if your kids can spend time with them.
My mom retired just so she could have more time to spend with grandkids and the youngest 2 love hanging with her after preschool or her coming over to swim with them, etc. My grandparents didn’t live close when I was a kid so I saw them hardly ever. It’s great that my kids have a good bond with our parents and that our parents are in positions to spend time with the kids. We use my mom maybe one night a month to babysit if we have an event or dinner to go to and she is adamant about us asking her before using a babysitter. It’s nice not having to go through finding and vetting babysitter.