what should my mother do?

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this happened middle of 2006 and concerns my parents. my dad had a mistress younger than me and my mother was not aware of it because she was busying herself gambling all night...she only knew of it when our neighbor told her and when my youngest sister told her. she was hysterical at first and tried to have fights with my father. being the eldest sibling i am guilty because i wasn't able to do anything about it or was blind by what was happening, maybe because i also have a family of my own and i also have a job to keep. now everything seems quiet but i know they are just keeping it all down so as not to upset my sisters or me, but i know that the problem is still there and that things are different. my mother now holds the phone of my father and she is always by his side wherever he goes, they go to church together and my mother still gambles but not so heavily. but i can still hear them fight over that other woman because my mother can still see her around because she lives nearby and still finds a way to contact my father...and it causes a big fight once again and again. she easily gets jealous and very insecure..sometimes she won't get out of the room and won't cook or eat at all. on my father's side, whenever they have a fight he would always say "im tired of you...why do u always bring it up?" and when he gets drunk he will always say "i want to be free" and then gets very quiet when he is sober. now im orn between the two of them...im not taking sides or whatever but if they can't stay together anymore why foce it right?