Yardley, Wilson, and Lynes divide familicides into four groups: anomic, disappointed, self-righteous, and paranoid.[15]
In this typology, the "anomic" killer sees his family purely as a status symbol; when his economic status collapses, he sees them as surplus to requirements. The "disappointed" killer seeks to punish the family for not living up to his ideals of family life. The "self-righteous" killer destroys the family to exact revenge upon the mother, in an act that he blames on her. Finally, the "paranoid" killer kills their family in what they imagine to be an attempt to protect them from something even worse.[19]