Does mc have multiple mothers now in the archduke family?
Yes, she has 4 mothers
First is Myne biological mother im the slum
Second is Rosemyne 'biological' (actually adoptive) mother who had die
Third is the first wife of Rosemyne biological (actually adoptive) father, her step mother
Last is her adoptive mother from the archduke family
Actually, she would have 5 mothers if we count the mother before she become Myne
As Rozemyne, the archduke's adopted daughter, she has 3:
● Rosemary, Karstedt's 3rd wife who already passed away was supposed to be the biological mom
● Elvira, Karstedt's 1st wife who supposed to have adopted her after Rosemary died - and as Rozemyne becomes the de facto mom
● Florencia, Sylvester's wife who becomes Rozemyne's adopted mother
https://agscomics.com/series/reincarnated-as-the-mastermind-of-the-story/
If you looking for all translated chapters for this manga, it can be found here.
If you go back to chapter 12, it has one page marked as 11, i forget when but there are was extra chapter that was either unnumbered or became a extra of a different chapter which is why we got a strange chapter count but anyway, today new chapter is actually ch14, we got a missing chapter.
https://agscomics.com/reincarnated-as-the-mastermind-of-the-story-chapter-13/
Here the actual chapter 13.
Honestly i find this story kinda refreshing. Mc is smart, her sister isn’t abusing her position, male lead seems to only love mc. And there are people, the mc can trust.
Just glad we got a official translation, the fan translation seems kinda confusing.