It is estimated that one third of sexual abuse is perpetrated by children, with some as young as four engaging in sexually harmful behavior. Overt peer-to-peer abuse is commonly seen in sexual harassment and sexual bullying, peer-to-peer sexual exploitation, and the use of sexual violence and rape in gangs. There is however a more nuanced, often unspoken type of sexually harmful behavior which is usually under-reported as it masquerades as consensual sexual experimentation between children, especially siblings, step siblings and cousins. To fully differentiate between consensual sexual experimentation and sexually harmful behavior it is critical to understand both typical and atypical sexual development in children and young people. This workshop will examine the nature and dynamics of sibling sexual abuse (SSA) by children and young people, its impact and long-term effects. We will distinguish between typical age appropriate consensual sexual curiosity and sexual experimentation and atypical sexual behavior which is non-consensual and sexually harmful. The aim is to enable practitioners to identify sexually abusive behavior between siblings and help clients distinguish this from consensual sexual play. The workshop explores the role of grooming and examines how such abuse is normalized by being presented as developmentally appropriate, consensual sexual exploration and experimentation. Strategies such as enticement through playing games that lead to sexually harmful behavior and encouraging sexual activities with other children will be unpacked to provide a deeper understanding of how developmentally inappropriate, non-consensual sexual interactions can make it harder for children, parents or adults in the child’s psycho-social world to legitimize this as sexual abuse and respond appropriately. To do this, this two-day workshop will explore how parents and primary caregivers can talk to their children in an age appropriate way about sex and sexuality to help protect them from sexually harmful behavior. It will explore the range of risk factors in sibling sexual abuse such as a history of CSA, trauma, Adverse Childhood Experiences as well as individual, family and socio-cultural factors The workshop will also examine how to work with adult survivors of sibling sexual abuse, facilitate disclosure and identify their experience as sexually harmful so that they can begin to legitimize their abuse and understand how it has impacted them to begin the journey of recovery and healing. Participants will be encouraged to develop a case formulation based on a case vignette to identify how they might work with a survivor of sibling sexual abuse. Attention will also focus on prevention strategies to minimize the risk of sibling sexual abuse. In order to bear witness to those who have experienced sibling sexual abuse it is crucial to explore one's own values and beliefs around sex and sexuality and how to talk about sex with children and adult survivors without feeling embarrassed or ashamed. Through a range of experiential exercises and question-and-answer sessions participants will be able to gain a deeper understanding of the nature of sibling sexual abuse and how to enable survivors to give voice to their experiences and legitimize these.