Not as bad as her own mother and rest of the familyworst mother ever
It seemed like her own mother was breaking the cycle and wasn't preparing her to become the "womb-sama". It was said in the lore dump 2 chapters ago (I think) that the daughters after the first were brain washed at an early age to want to become "womb-samas" and birth the killing curses. In Yoshie's Maternal Handbook Mirai read Yoshie mentioned it was strange Mirai wasn't going through that education/brainwashing. As for why the aunt was used to do a curse killing we don't know the reason for at this point but presumably there was athreat to the family. Perhaps Mutsu (Kayas grandma) wasn't the Matriarch of the family yet.Not as bad as her own mother and rest of the family
I think you got all of them down, as for the last bit, I'd assume the grandma was taught to be strict for so long she just can't speak honestly when it matter and at that point she also didn't want Mirai to dig further into the family matter about the curse womb (which well, she did anyway)It seemed like her own mother was breaking the cycle and wasn't preparing her to become the "womb-sama". It was said in the lore dump 2 chapters ago (I think) that the daughters after the first were brain washed at an early age to want to become "womb-samas" and birth the killing curses. In Yoshie's Maternal Handbook Mirai read Yoshie mentioned it was strange Mirai wasn't going through that education/brainwashing. As for why the aunt was used to do a curse killing we don't know the reason for at this point but presumably there was athreat to the family. Perhaps Mutsu (Kayas grandma) wasn't the Matriarch of the family yet.
Was Mirais upbringing rough? Yeah compared to a normal family. Compared to how the family had been doing things the last few generations though it was better than being brain-washed and dying. She wasn't going to be used as a curse bomb and even was sent to public school to at least be given an opportunity at a normal life outside the home, however that didn't end up well since people knew what family she belonged to.
Also the mother willingly gave up her life to protect Nana. I think she was really trying to change, and actually ended up drastically changing, the way things had been done in the family.
Mirai probably thought the cycle would continue and didn't realize her mother stopped it with Nana and her. I mean Mirai can mean "future hope" symbolizing the future of the family no longer relying on the awful brainwash birth curse method. Mirai not realizing that decided to try and end the whole family so it never had a chance of happening again by willingly becoming a "womb-sama" with the killing curse directed at the whole family.
As to why the mother or Nana never tried to clear any of that up with Mirai is the weak point of the plot for me so far.
they probably tried, but she is sooooo focus on her hate of the ebisumori family that everything her mother tried to do good to her backfire, when she asked how her aunt die, her mother never explain the ritual, shielding her from the fate living weapon, that was the spark of her hate for the family later, when her mother give her the opportunity to be a normal girl, she see it as a way to reject her from the family, when her sister tried to talk to her in chapter 43, she crack and rant about how her sister and mother have the "easy way", at that point whatever they say is considered a lie.As to why the mother or Nana never tried to clear any of that up with Mirai is the weak point of the plot for me so far.