I used to let my kids play their games on my account. One day a month or so ago, I found my 3 yr old had logged in and was playing my Destiny account. He had no idea what to do but had managed to complete a Public Event and get a Legendary Engram by just bumbling around some how. It was really cute, but also very alarming. Luckily nothing was deleted. I immediately put a password lock on my PS4 and created a kid sub account. Kids will never touch it again.