It’s “The Boy In The Striped Pyjama”

It’s about a boy (9 years old) who doesn’t know his father is a Nazi. (after a while he discovers a boy in a striped pyjama, who’s captured in a concentration camp)

Okay this is what it says litterally:

“Heil Hitler” he said, which was, as far as he knew, another way of telling people ‘Goodbye and have a nice day.’

..

I don’t know why this hits me so much but it does and it’s terrible.

Everybody’s Changing