Actually, Koga's tribe didn't kill her family (although his wolves did kill Rin). According to http://inuyasha.wikia.com/wiki/Rin: "At one point in her life, Rin had both of her parents and two or more siblings. Her entire family (excluding herself) was slaughtered by a thief when she was younger, and this traumatizing event that she witnessed led to her becoming mute and not speaking to anyone.[1] Because of her family’s mutilation, Rin was ‘taken in’ and ‘raised’ by the other villagers and allowed to continue living in the village. She had her own small hut just on the outskirts of the village, and she lived alone there. It can be assumed that the villagers would often beat her. She is seen being beaten one night at the fishpond and she shows no fear and walks away in a casual manner, without a word or flinch." She had found Sesshomaru recovering in the woods and kept bringing him food. It was at one point when she returned to her hut that she found a thief that Koga's tribe was chasing...Koga ordered his wolves to eat and they slaughtered the whole village. The wolves chased Rin and killed her. Sesshomaru revived her with Tenseiga and the rest, as they say, is history.
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