I look after my DGD for 2 days a week the other gran 2 days, but where I am organised and lay the toys out for her and try to do a selection of activities both educational and fun, the other gran just doesn't seem to bother, she lets little one out to play with next doors kids, there is no fence so they just swarm everywhere, DGD is under 2 so I worry. 'other' gran says she keeps an aye on her and so ,supposedly, does the neighbour. I really don't like kids out playing disorganised play, just running around and shouting. I would prefer them to have organised stuff like I do.
When my DD was small, I would ask friends to the house for a couple of hours, lay out games, colouring books etc on the dining table and put garden toys in garden and play with them for a few minutes at each activity(depending upon age). I had drinks time and story time all planned and it seemed to work. I chose nice kids who were clean and well mannered. No way would I have snotty nosed, dirty or rude kids in to my house to play. At the appointed time I would see the kids back home and their parents always knew where they were at all times. Why cant parents nowadays be like that. It worked for me.