--SPOILER--
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The mother is first threatened with a knife by her youngest daughter, and finally stabbed (one time, not shown directly but heard and you see the reaction) to death by the other.
Someone is hung by the neck and it may have been self-inflicted (it’s ambiguous how exactly the character got into the noose). However, it is strongly implied that the character was possessed and/or influenced by an evil spirit at the time, so they were not acting of their own accord.