So how many time can a parent leave their youngest child home during a vacation?

So how many time can a parent leave their youngest child home during a vacation without having child services called? The record right now is TWO. It's really starting to effect the little guy, his name is Kevin and the first time they left him he was 8 and 2nd time he was 9. He lives in a really nice neighbor hood but you know burglars hit the streets during the holidays. He is quite smart, very mature, and responsible. Lets hope they don do to him what they did last year, let him get on the wrong plane. Should I report them?