If you brought sand toys to the beach/park for your child would you care if someone else’s child started playing with them too?

Sometimes we go to the park or beach and bring stuff for building sandcastles, digging, etc.

Multiple times other people’s kids have just joined in and started playing with them. Usually their parents panic and are like “those aren’t yours!” But I always tell them that I don’t mind and they can play with them too, but I wanted to know how other parents feel. If you bring a bag of toys like that to a public place do you care if other kids join in and use them too?