In a future chapter, Yamaoka and Kurita encounter the doctor who treated Yamaoka's mother. Kurita pulled some strings to get him and Kaibara together, demanding a thorough explanation of what happened to Yamaoka's mother, Kaibara's wife.
The mother had a naturally weak heart, and Kaibara had recommended not bearing a child because of it, but the mother insisted, saying she wants the genius in Kaibara's blood to be passed down, no matter the cost. Understandably, this exacerbated her heart condition, and she was largely bedridden after Yamaoka's birth.
Despite the doctor's short estimate of her remaining life, she continued to live past that, constantly supporting Kaibara in his artistic endeavors. The doctor posits that Kaibara's constant scoldings gave her the determination to keep going and working until she could satisfy her husband, and that it was thanks to him that she lived as long as she could.
Yamaoka considers this explanation unsatisfactory, as it still demonstrates that Kaibara did in fact, abuse her even in sickness. His relationship with Kaibara would remain strained, but we see here what the general public thinks of Kaibara. His wife's heart condition was not made public knowledge, and there are people who see his abuse and consider him a monster, but those who are closest to him (Toyama, Kyogoku, Nakagawa, etc.) know what happened, even if Kaibara is too stubborn to explain to them, and are more sympathetic towards him.