Can grandparents supervise alone at splash pads?

Grandparent supervision works well in the right context but can go sideways when the situation outpaces what they can physically manage. The math to consider: how many kids, what ages, how big is the pad, how mobile is the grandparent, can they hear and see clearly enough to track multiple children, and do they know the kids' swim and behavior tendencies. One or two grandkids on a quieter neighborhood pad is comfortably manageable. Three or more young kids on a large multi-zone pad with crowded weekend traffic is a recipe for someone wandering. Bring a phone with the parents' numbers preloaded, agree on pickup times in advance, pack a 'go bag' with sunscreen, snacks, and changes of clothes already packed by the parents, and pick early-morning visits when crowds are thinner.