I often feel like a sheepdog - I round them up when they're straying into something they shouldn't be doing, prompt them to try something a bit different when they're looking a bit lost or stuck for ideas, make myself a little bit scarce when they're looking for someone to take sides or argue, and pen them in the kitchen for food or baking if I want them to concentrate, learn or have some fun round the table.
They do like me to join in with them, though - easy to get down on the floor but not up again! They love sitting in the garden blowing bubbles and making daisy chains like we did at our grandparents' house. I only put structure in when I think they need it. Some people like structure they can depart from occasionally. I like structure I can resort to occasionally. There are a few house rules, but they are free and easy to play as they like within those boundaries.
Memories of the Swinging Sixties
I have a mobility problem and my husband's angry all the time