Familicide, or the killing of one's own family members, especially your spouse, progeny, or parents, has always been viewed poorly in most societies, though in some cases there were exceptions.
For instance, in Ancient Greece and Rome the practice of leaving a newborn child to die of exposure if they were born physically deformed was considered perfectly acceptable. It has also served as a method of gaining greater power via getting rid of competition, or for conserving resources in extreme cases during hard times (if the bodies didn't also end up becoming the resources).
Obviously, this is a sub-trope of Domestic Abuse, and is the most extreme version of it. For other (non-lethal/violent) instances of family tension, see the Dysfunctional Family Index. Examples that don't fit into any of the below tropes should only be listed on their respective works pages.
Tropes:
- A Deadly Affair: When an extramarital affair results in one of the parties involved killing another.
- Death by Woman Scorned: When it's done by an enraged spouse as revenge for being cheated on.
- Genocide from the Inside: Killing off your entire society, which would include your family by default.
- Grandfather Paradox: Killing one's ancestor via time travel, which may end up unmaking the murderer in the process if this happens before they have the ancestor who would eventually beget them (unless they replace their own ancestor in the family tree).
- Honor-Related Abuse: When it turns into honor-killing, killing someone for perceived "dishonor" of their family.
- Inheritance Murder: Murdering family members to obtain their inheritance, or murdering the proprietor of an estate to gain wealth.
- Princeling Rivalry: Killing off competitors to a royal throne.
- Insurance-Motivated Murder: Murdering a family member (usually a spouse or parent) to collect the money from their insurance.
- Kinslaying Is a Special Kind of Evil: When killing one's relative is considered an irredeemably evil action.
- Offing the Offspring: Murdering one's own children (filicide).
- One Twin Must Die: Killing one of two twin siblings for superstitious reasons.
- Pater Familicide: The murder or Murder-Suicide of an entire immediate family unit, usually by the father, due to an inability to deal with personal failure.
- Self-Made Orphan: Killing both of your parents or your sole living parent.
- Sibling Murder: Someone kills their own brother (fratricide) or sister (sororicide).
- Cain and Abel: When Sibling Rivalry turns into bitter hatred with murderous intent.
- Cain: The Biblical Bad Guy who murdered his brother Abel.
- Cain and Abel: When Sibling Rivalry turns into bitter hatred with murderous intent.
- Til Murder Do Us Part: The killing of your spouse.
- Black Widow: A woman who repeatedly kills her husbands (mariticide).
- The Bluebeard: A man who repeatedly kills his wives (uxoricide).
