fake siblings to lovers

decided they are family after they met, since they didn’t have one

he lied to her about being her brother after she entered his world 

„half siblings“ that grew up apart from each other, she was a daughter of his family but unknowingly had different parents 

neighbours which parents are best friends

neighbours that grew up as a family 

neighbours with complicated parents that are best friends

after she looses her family and memories her childhood friend takes her in as her sister to keep her protected 

his parents adopt her at an older age