... since anpu wife was jealous with anpu brother she planned to ruined anpu good relationship with his brother...
... anpu wife waited him,, then afterwards she had a talk with Anpu and told him some wrong stories about what is his brother doing to him...
.. then Anpu became so angry with his brother that he would kill it..
... but in the end Anpu know the whole truth of the story and besides instead of killing his brother he killed his wife...
.. am I right?