Really complex subject but I'll start with the Romans tonight and continue tomorrow with other European civilizations.

In ancient Rome if a daughter lost her virginity intentionally, the father was expected to KILL her. By this I mean choose to have sex with the cute boy, voluntarily sold herself in prostitution, and such.

Even victims of rape depending on the period were not exempt from this and can be killed on the spot for being discovered that she is "tainted". The shame of a rape victim in Roman civilization was so great women frequently killed themselves almost immediately upon the event. For much of Roman civilization pre-Republic the father had to kill the daughter to clean the family of impurity and Roman mothers often supported. In fact one of the wars Rome fought against the nearby Italian city states before she became a Republic was as a result of the rape of a noblewoman who committed suicide shortly afterwards by a noble of Serbines and the Romans retaliated by an event known as "Rape of the Serbines".

Later particularly after the introduction of Christianity, it got lenient enough that Roman families instead avenged the rape by going on a vendetta against the rapist that often didn't just end there but also punished the rapist's family and many family feuds lasting generations was a result of the rape. I should mention this also varied depending on how corrupt the local politicians were and what the social status the Roman family was, the government may intervene to execute the rapist. Even than among the Patricians, it was common for a nobleman to volunteer to step up and challenge the rapist in a duel to the death before any government intervention came.

Now as I mention this honor kililing of impure women down post-Republican and the coming of Christianity. The church even tried to protect prostitutes and promiscuous women who confessed and took a vow to stay chaste afterwards but this did not prevent individual families from killing said formerly sexually active daughter because they were just that disgusted and ashamed their reputation was in tartars.

Even straight into Christian Rome-and much of Medieval Europe-husbands and grandfathers committing honor killings because the wife committed adultery was so common to the point that even the Church to a degree supported it and it was legal by local governments to do so.

Thats just the basics on a specific topic of the whole discussion. We're not getting into Roman fathers personally killing sons who were deemed as embarrassing the family or betraying Rome, mothers who order their other sons to jump a male who intermarried with "barbarians" in a beating to the death during certain periods of Roman civilization, and so on.

I'll get more on medieval, Greek, and even gunpowder era Europe-believe it or not there was still killings to "clean a family's sins" as late as the Victorian era among the aristocrats.