Sentence:  Terms related to familicide include <WSD>filicide</WSD> (the killing of one's child or children), uxoricide (the killing of one's wife), fratricide or sororicide (the killing of one's brother or sister), avunculicide (the killing of one's uncle), and nepoticide (the killing of one's nephew). 
Meaning of the word marked with <WSD> tags:  The killing of one's own child.