There's a way.

Chatting with my friends who visited me yesterday, I threw a glance at the facing apartment because there was something moving on the top of the building. I couldn't believe my eyes; it was my son! He was running! There was a four-story building with no fences! I jumped to my feet, ran out of my room, left my friends behind without explaining what was happening.
"What are you doing THERE!? Come down here at once!!"
My son immediately obeyed me. looking very seriously. I was lost for words when I heard my son's confession. He said this was not the first time he played there. He even played catch with his friends standing on the ground. Oh, my, I didn't know anything about it.

When my children were very little, I always kept eye on them. Time has passed, and now my both children are pupils. I must admit that I don't know much about how they are playing outside. I thought I understood them, but it seems to have been a dangerous notion. No matter how old they are, unless they are adults, parents need to be sharp and ready to take the responsibility...