Obviously a man who'd managed to bypass vast tracts of biological human life then, Noel. I've known a few like that. They always seem very contented indeed to me, which I suppose, ought to tell us something. Though quite what, I don't know.
I've tried to track down how the family knew about Grandad, Brian, and it seems to stem from Granny in her late 80s, talking to a pharmacist son who had the sense to spend hours asking her about her life (so much is lost through people not doing this - in her life she went from bustles to mini-skirts, though not personally of course, and from horse-drawn carriages to Concorde).
Anyway, it seems I was wrong, and Granny did not resort to "No!" She resorted to Rendall's tablets - a female contraceptive of doubtful efficacy. Happily, they worked for Granny though. She confided to her incredulous son the information that they were so efficient, one dud tablet was deliberately put into every tube, for fear the human population might otherwise seriously decline. Granny used to carefully examine every tablet, to try to detect the dud.
How naive it seems to us. Yet how sensible, in those days, for someone trying desperately to fulfil her duty to her entire family, and to live to tell the tale.