Re. your ‘history of panto’.
I think it’s better NOT to use your grandfather’s memoir as a reference. Re-reading first two chapters, I was startled by the frequency with which he blundered into areas of contention. Within twenty pages, he’d cheerfully acknowledged transgressions that ranged from racism to bullying and ‘looking at girls’ legs’ (a confession that’s followed by a weirdly delirious description of Nina Kelly’s calves.)
As a social historian, you might want to draw attention to this, but as a GREER, I think your first loyalty should be to the family reputation. Even innocuous passages might encourage curious readers to better acquaint themselves with a worldview that many of them will deplore.