Breakdown of kazoku no naka de imouto ga ichiban wakai.
のno
possessive case particle
がga
subject particle
でde
location particle (for events and actions)
中naka
in, inside; middle
Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita
Hepburn romanizationwatashi wa chuugoku kara kimashita
