The majority of studies examining familicide involve the male head of the family killing his wife or intimate partner and children. Little research exists on familicide cases involving children killing one or both parents plus other family members (siblings, grandparents, etc.). This study used the National Incident-Based Reporting System, which currently contains arrest data for about 25% of the U.S. population, to examine familicide incidents perpetrated by adult and juvenile offenders over the 20-year period from 1991 to 2010. Fourteen cases of familicide involving two different family victim types were identified. None of these cases involved multiple offenders. Frequencies reported include victim, offender, and incident characteristics. The typical familicide offender was a White male approximately 26 years of age. Firearms predominated as murder weapons in these incidents; however, when a biological mother was one of the victims, offenders used more diverse methods. Only one case of familicide involved a female offender. Newspapers were searched to supplement available case information. Findings from this study were similar to cases identified by Liem and Reichelmann as "extended parricide cases" in their familicide study using Supplementary Homicide Report data. Study limitations, implications, and directions for future research are discussed.

The majority of studies examining the killing of parents and step-parents by biological and stepchildren involve a single victim and single offender. Little is known when parricide incidents involve multiple victims or multiple offenders. Using the National Incident-Based Reporting System (NIBRS), this study examined double parricide incidents involving single or multiple offenders over the 20-year period 1991-2010 with the aim of investigating juvenile and adult involvement. Forty-five incidents of double parricide were identified and verified; in 35 of these cases, the offenders acted alone. Frequencies reported include offender, victim, and incident characteristics. The results indicated that the typical double parricide offender who acted alone was a White male approximately 30 years of age. When multiple offenders were involved, the offenders tended to be younger and were more likely to include a female accomplice. Newspapers were utilized to augment available case information. Study limitations, implications, and directions for future research are also discussed.

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