We live in a nice, portered block of flats in central London. There are 3 floors and a basement which leads to the underground carpark. We live on the first floor. I found out yesterday that Dad has been letting our son ride the lift on his own, although Dad waits at the lift doors on our level. I voiced my concern as I think it's unsafe: whilst it might well be fine, he is out of sight and there are risks that can't be ignored, like him getting into the carpark if someone leaves the door open, a resident or visitor being inappropriate or even harming him, or the lift breaking down. Dad says it's important for his development, his independence, but I think it's a step too far, an unnecessary risk and irresponsible. I also think it could lead to my son making bad choices, as he now feels it's ok to go off without Mum or Dad.