Actually, forget I said I would.
I just remembered something that happened back home. My neighbour had a 16 year old and a 3 year old. She had to go into work for a an hour or so, and left her 3 year old son with her 16 year old daughter, thinking this was fine. Meanwhile her daughter got bored, took her 3 year old brother to visit a friend, a 12 year old girl, down the street. They were playing outside the 12 year olds house, when the 16 year olds school friends walked past, and the 16 year old decided to leave her brother with the 12 year old, and went with her friends. Now, it is part of the story that the 12 year old lived on a pier.
So, the mother comes home from work, looks for her children, and can find neither.
It was hours before the truth unravelled. While her 16 year old had merrily been hanging out with her mates, her brother fell of the pier and drowned, and the 12 year old was so scared she ran home to hide.
Sure, this will not repeat, it is a totally different scenario, but you cannot foresea what will happen even within 10 minutes of leaving your home.