Kinda knew it that Shizuki is gonna save the day, but she has done far better that I thought hah.
And Miyami is definitely their real mother name, but this woman(probly aunt) just easily slipped with some simple questions lol.
That DNA test could easily be falsified or even if the resulted was true, that's still doesn't mean she's really their mother....
Since bringing the cloning here would be a bit too much, so I'm gonna say "twin" just like the daughters.
From chatgpt
Do not underestimate kids these days. I'm teaching from grade 1-6, and their conversations could be very mature in both positive and negative topics. They may not as smart as the lolis in this manga, still not very far-fetched.