Avirah- You still have no basis whatsoever for accusing Rav Henkin of lying. You base this accusation off Rav Yehudah Henkin quoting his grandfather as saying that those who say Hallel on YH have a basis, but as i mentioned before, this does not contradict Rav YE Henkin’s view about the Shalosh Shevuos at all. It just shows that he had enough respect for the Gedolim he disagreed with in Hashkafah, so as not to be Moche against their Talmidim who follow them. You find this all the time, that while Gedolim may feel strongly a certain way, they won’t be Moche against those who are Noheig differently, because they understand that the others have who to rely on. In regards to his Teshuvah about saying Kaddish, i don’t know why you’re assuming he distorted his grandfather’s view.
The fact that Rav Henkin went to mixed high school has nothing to do with this discussion. No, Rav Yosef Henkin was certainly not happy that his grandson went to mixed high-school. This has no bearings whatsoever on Rav Yehudah Henkin’s Gadlus or Neemunus. Rav Yehudah Henkin never supported co-education as a Rabbi, and the fact that his father sent him there has as much bearing on Rav Yehudah Henkin’s Gadlus as it does on Rav Nosson Tzvi Finkel’s Gadlus (he also went to a co-ed high school). In fact after Rav Yehudah Henkin finished high school, he was Mishamesh his grandfather for five years and received Semichah from him, and was probably one of his closest Talmidim.
Limaaseh, i agree that Rav Yehudah Henkin’s Hashkafah was in some ways different than his grandfather’s, but as i am quite bewildered at your shocking accusation that Rav Henkin “spread numerous lies about his grandfather”, when you provided practically no basis; just a few assumptions which can easily be disproven.