Strong and cohesive actions are needed. It is occurring every day, and it knows no geographic or socio-economic boundaries. Meanwhile, victims Define sexual abuse between siblings sibling abuse remain unseen, waiting to be found and Define sexual abuse between siblings. Treating sibling abuse families. Teachers may have more opportunities to observe sibling dynamics in school settings, but unless they are sensitized to the dynamics of sibling incest, they are unlikely to discern indicators that could lead to uncovering the secret. Because young sibling victims often appear free of trauma effects or other evidence of abuse and because they are likely to feel at least partially complicit with the behaviors, the indicators of sibling incest remain buried. Great Valley Publishing Co.