I hate My Uncle! Please suggest something

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I hate my Uncle.why? coz a yr ago on one fine night i got up to have water and i heard my aunt screaming and when i peeped in my her room i saw my Uncle pulling n forcing my Aunt to make out with him...my Aunt was pregnant and few months later she had a mis-carraige..and i think its because my Uncle forced her to have S*X with him...i hold my Uncle responsible for the death of their Child..My aunt says its wrong but i know she is lying coz if she blames her husband for all this she will b in trouble coz my Uncle is a pHYSCHO...wHAT SHOULD I DO..I cant let my Aunt live with this Animal..Please suggest?