These spoilers giving me headache. STUPPPP!!!!! AND MY DUMB SELF WANT TO CLICK THAT '+' S...

It probably won't happen (hopefully) though it depends on the manga company and author (who could have changed their mind). Sex-ed back then and further would involve servants, apothecaries; or physicians (if I remember correctly) for males, not family members. Or maybe it did, (⊙…⊙ ). There is one I remember reading where an older male family member (father, uncle, or brother) would take the youngest to an whore house.