Learn what "why would your sister kill your father" means, when people say it, and how to use it naturally in English.

The speaker is challenging the logic of an accusation and asking why someone would do something so extreme.
From On One Condition, Episode 12
One person is questioning a shocking accusation or suspicious theory about a family member.
Use it in a serious, emotional argument when you want to question a claim. It is not casual and sounds intense because it mentions murder.
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