it must be a nj epedmic. i am in nj and going through the same BS and because of much the same circumstances. my wife was also abused, by her moms second husband and although my wifes mom knows about it, it has pretty much been swept under the rug. her family problems only start there, all the major influences in her life are or were alcholics and my wife does love to party. we were married in june of last year, her dad suddenly died in july and we seperated in dec. her dads death really seemed to uproot alot of the issues my wife has gone through.
anyway as for advice: good luck, worry about yourself. what they are going through we basically can't control. i am at my wits end and have finally had enough, you can't help those that wont help themselves and i am planning life without her, once i get through it i will be better off being that my wife and probably yours too is going to be tormented there entire lives regarding the abuse.