and that Mr. Cantor...er Kantor??? is Pearl's biological father. I think.
No such undertaking has been received. Not on that specific point anyway, I think. The
Dramatis Personae thread gives Miriam's parentage as we have always understood it - but "father" in that sort of context wouldn't necessarily mean biological. Adrian and Miriam are more or less the same age but what Daphne did confirm would seem to make it pretty unlikely they're twins. But Miriam could be Adrian's half-sister, courtesy of Patrick. And he appears to have been very courteous around that time. Also, there are magical elements to the story.