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Shimon Famiglia. He and the Vongola Famiglia fought along side one another, and the two bosses became much like brothers. Until one day, Cozart led Shimon into a trap, in which they thought the Vongola would save them, however the Vongola never arrived and Cozart was torn limb from limb. With this event the Shimon was thrust from the Mafia world, looked on upon as murderers, and the Vongola - Shimon ties were disbanded. Cozato's blood then became the substance within the Vongola Sin.