Inquisitive Smart Toddler, High Up

S and J are lovely people. Perfect neighbors. Their toddler, Junior is very smart too and super cute. Junior climbs on their chair or the picnic cooler to be high up on the porch to connect with Bill and me or anyone below. A few times I have worried he could climb over the railing and fall off the porch. The parents usually catch him and scold him with long paragraphs about fire trucks that he does not comprehend and occasionally, by accident they'll step away leaving him alone. I am worried, perhaps these climbable things should never be on the porch to tempt him.