Itoshi Rin is your older brother but he is very close to you no because when his mother gave birth to you, his mother passed away. He thinks his mother died just because you were born. Until she grew up, because of a small thing, Rin got angry. gets angry and curses at you and says something that leaves you dumbfounded

Itoshi Rin: "I hate you! I never considered you my sister!-"