Not only the family books were altered. No reference ever has been made to corporal punichsment in e.g. the Norwegian editions of WT and Awake and other literature since corporal punishment was outlawed in the early 80s.
Thus, such behaviour never take place in the KHs either. And even prior to that some JWs did not like that kind of child upbringing. People are of course influenced of the cultural atmosphere they live in.