Exactly when was it that Hashem said it is assur for boys and girls to talk to each other ort sit together at a simcha? Please quote me HASHEM’S exact words on the subject, not some source in some obscure sefer somewhere that was not based on halacha, but rather on the personal feelings of its author. ALL of kall Yisroel stood together at Har Sinai. They all marched together in the midbar.
And yes, Hashem knows my kids far better than I do, but I know them better than the Gedolim who never met them, do.