"Hmmm, social services would be coming down like a ton of bricks on a 'normal' family that did this..."
What hysterical nonsense! SS wouldn't care about this at all!
As a young teenager, I was out with one of my friends' family. As we left the venue, her dad counted that he had five children and thought he was fine to leave. He'd just forgotten that I wasn't actually his and there was someone else left inside!
Easily done, I imagine. If and when I do it, I imagine I'll feel very guilty but I won't be losing any sleep over SS coming for me.