It is neither here nor there, but i guess it depends on the style of the grandparents. My daughter's paternal grandparents have never once come to see her daycare, nor did they know the name of or location of the in-home daycare she went to previously. They aren't uninvolved in her life.
My parents, who live 2000 km away, have both been to my daughter's current daycare and knew her previous daycare provider. When my son was in daycare, and we lived close to them, my parents would often pick him up if I couldn't, or if I needed a break.
I thought it was odd that neither one had any knowledge of Casey and Caylee's daycare arrangements, but I guess that is just because of my situation. It certainly isn't sinister.