Manual on the implementation of the UN Declaration of basic principles of justice for victims of crime and abuse of power

TLDR: A person may be considered a victim, regardless of whether the perpetrator is identified, apprehended, prosecuted or convicted and regardless of the familial relationship between the perpetrator and the victim as discussed by the authors.

Abstract: 2. A person may be considered a victim, under this Declaration, regardless of whether the perpetrator is identified, apprehended, prosecuted or convicted and regardless of the familial relationship between the perpetrator and the victim. The term "victim" also includes, where appropriate, the immediate family or dependants of the direct victim and persons who have suffered harm in intervening to assist victims in distress or to prevent victimization.