mauvecraze, who told you she lives "normal life"?
most likely her life is miserable... poor lady..
it is really sad to hear such stories.. but hey there is very little what you can help with.. as it's mentioned, reporting won't be benificial for anybody, unless your mom is ready to leave him and want a revenge...
maybe you can talk to your dad?

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"What lies behind us and what lies before us are small compared to what lies within us."
Oliver Wendell Holmes