Filipino married to a Japanese problem

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A few years ago my 18 years old younger sister work in Japan to support her daughter. She met a guy there, had a child with him and after the child was born, they decided to get married here in the Philippines. while in the process of getting married, my sister found out that her fiance was just recently divorce to a Chinese woman and had a son same age with their son. note that the guy's divorce is January 2006 and married my sister in May 2006. 1 week after the wedding he went back to Japan to resume his work. Her husband came back in the Philippines on December that year, they have a big argument about his mistress. After that incedent, the Husband went back to Japan, their relationship is gone awry and her husband give her a financial support for only a year and it stop. he did not give any financial support even for his son. My sister is trying to reach him but he cant be reach because he change his cellphone and he move out. My sister also finds a way to make contact with him through the filipino-japanese foundations but to no avail because he cannot be found. just recently my sister receive a divorce paper, her husbnand wants to marry again so he filed a divorce but later he found out that his marriage with my sister was registered in Japan, without him knowing it. my sister will agree with the divorce with her own terms, her terms is that her son, will be registered in Japan, that she can go to Japan to work again and her husband will support their son. but the husband will file a complaint against her regarding the registration of their marriage in his home country allegedly without his knowledge if my sister will still insist her terms. Later, my sister heard from an acquaintance of someone she knew, who lives in Japan that she won't win the case. How true is this? but should my sister concede to what her husbands wants and just agree to the divorce without demanding anything from him, my nephew will lose it all, which is out of the questions. Besides, it has been quite a long time since the husband gave some support to his son. please anybody, if you know anything to help me so i could help my sister, it would be great.