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Incest, which is considered as a special topic in child abuse, is one of the most traumatic forms of sexual abuse. In incest cases, notification rates are relatively low, especially the sexual abuse between siblings remains hidden much more than other sexual abuses. In this case report, which appears in a random manner, 12-year-old male patient, who was abused by his sister, will be discussed. Our incest case has a big importance because of having a sister as an abuser, since incest abusers often considered to be fathers or brothers. At this point, the possibility of having the abuse carried out by anyone from children's social environment including each family members should be kept in mind. [Anadolu Psikiyatri Derg 2015; 16(5.000): 372-374]