Since Yuni's family are all practically dead she's living with Madoka and Hikaru, which end up being her step mother and step sister
You know how the original story goes
Yuni: Cinderella (or Yuella)
Madoka: Step mother
Hikaru: Step sister
Lala: Fairy Godmother
Erena: Prince
Prunce + Fuwa: Similar to the mice
