Learn what "how could you kill your own sister" means, when people say it, and how to use it naturally in English.

It is a strong accusation expressing disbelief that someone could harm a family member in that way.
From The Dumb Billionaire Heiress In Love Part Ii, Episode 47
The speaker is angrily accusing someone of killing their own sister.
Use this only in extreme dramatic conflict or crime-related contexts. It is very harsh and not normal everyday English.
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