Siblings play a unique role in each other’s lives, imitating the communication of parents and the influence and help of friends. Since siblings often grow up in the same household, they often come into contact with each other, as do other family members. However, while sibling relationships may have both hierarchical and reciprocal elements, these relationships tend to be more egalitarian and symmetrical than with family members of other generations.

In addition, relationships between siblings often reflect the overall state of family cohesion. Siblings typically spend more time with each other during childhood than with parents or anyone else, and sibling relationships are often the longest relationships in people’s lives. Incest between siblings was a deliberate practice among some historical ruling families. Incest can also be in the form of sexual abuse between siblings. It can happen between siblings, or between brother and sister.

Anxious conflict between siblings can be caused by the perpetrator satisfying their needs and desires. When it comes to understanding, the main cause of sexual abuse between siblings is the multiplex. There are many factors that could be the root cause; family environment, inappropriate parental behavior, dysfunctional family structure, etc. A romodeling parent relationship with inappropriate sexual exchanges is likely to affect one child to become a sexual abuser of their sibling. The child is imitating the actions of his parents.