My Father came back to us. what I supposed to do.....

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my mother and my father have been divorce for 8 years. my mother and all of his son get abused for a year. my father cheating!! i think it is not fair for us to be treated like that. he married the woman and change his relogion. even so he was not change!! he remain brutal. so my mother divorce with my father. but several days ago he came back to us. we think that he is change, turn in to a good father for us but I guess that was a empty space. he always intimidate us to deny our mother and his parents in law. What should we do to face this problem?