the mother's name changes from shizue kotomiya to shizue fukisaka- are they just two different translations of the same kanji or were they two different names in the jp version?
honestly i would be surprised if a master disguiser didn't alter their voice while disguised.
though she should recognize his voice-- unless the confessions are just him saying "amen" or something and her talking his ear off
i think they were just depicting a chibi Shirukyi to show mor comedy and i believe they're still around the same age?
(im also holding out hope for yuri so maybe im biased)