Sounds interesting from the perspective of a foreigner. I have been in the kibbutz when they featured only the old rusty miniaturized 'tanks' from the War of Independence at the Warsaw Ghetto exhibition seems to be a much more tempting offer. However, if we are talking about children being ready to see Eastern Europe, it may be a worthwhile to consider watching the "boring" movies by the directors C. Lanzmann ("Shoah"), R. Polanski ("The Pianist") and A. Wajda ("Korczak", "The Promised Land"). Imo "Shoah" is the most important, however being 8h long is definitely the most "boring". "Korczak" is black and white and very old school, but with a very good Jewish actor playing Korczak. "The Promised Land" is off topic, because it is about Lodz, not Warsaw and about beginning of the 20th century, not the Second World War, still the (business) interaction between Jews, Germans and Poles is quite interesting. "The Pianist" is the easiest to digest from the modern perspective, with a very good Jewish actor playing the pianist.
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from the article: Experience the Warsaw Ghetto