Sui generis
In sociology, the "sui generis" is what has been externalized, then internalized in the overall public and becomes a part of society that simply exists in its construct. It is not something that is not thought to have been created, because it is imbedded in everyone's way of thinking and being. Instances include the idea of love, or going to school, or clothing belonging to a specific gender. These examples are "sui generis" for they simply exist in society and are widely accepted without thoughts of where they come from or how they were created.
Filicide
Filicide is the deliberate act of a parent killing his or her own child. The word "filicide" is derived from the Latin words "filius" and "filia" (son and daughter) and the suffix "-cide", meaning to kill, murder, or cause death. The word can refer both to the crime and to the perpetrator of the crime.