Our child is 1.5 years old and the kindergarden teachers are complaining, that he doesn't understand them and ask us every day to speak to him in German (the language of the country). My wife speaks her own language, I speak another, but my wife and me do talk to each other in German.
However the "One person, one language" (OPOL) method seems to suggest to not do that and be consistent. On the other hand this method is from 100 years ago.
I am not worried about German, with all the German around him, how is he not going to learn it?
We go to an expensive Montessori kindergarden too, so I guess the suggestion is not based in pure ignorance but rather a different approach?
For what it's worth, the 3 words he knows how to say well (apart from "mama" and "papa") are all German.
Will the suggestion from the teachers act against the OPOL method and perhaps hinder our child to learn his monther's and father's languages?