000646,
If someone choose to raise their children in the derech of the Chofetz Chaim,Chazon Ish,Tchebiner Rav,Satmar Rebbe, R’ Chatzkel Levenstein,The Steipler, R’ Moshe Feinstein, R’ Shlomo Zalman, R’ Pam etc. etc. & all the Gedolim in the history of Klal Yisroel who weren’t mechanech their children to be Modern Orthodox, there is no reason to tell them that they are being dishonest with their children.
On the contrary, someone who tells their kids that everyone is wonderful would be the dishonest one.
(I’m not saying to be rude or obnoxious to other types -aderaba- ALL Gedolim always treated everyone with civility & courtesy, but I don’t think you have to introduce your children to every “shittah” that exsists).