@marshymallowy I don't want to be the one to say it but... "step-sister" is wrong too haha.
Step-sister would mean she is the child of either the mother or father who married MC's mother or father making only one of the parents biologically the parent of MC.
Since both parents are the biological parents of MC, half-sister is also wrong since neither of the parents are the biological parent of the sister so don't use half-sister in case you were thinking of it haha.
Just use "foster sister" (meaning a girl brought up with another child of different parents) or "adopted sister".
Also page one should be "clinic"
Thanks for actually going back to fix mistakes so quickly in the first place!