The law is still apply to him, as he did not divorce with his Chinese wife. He can try to divorce with his chinese wife, then it is legal to marry with you. Actually, i think it is kind of cheat that he never tell you he has marriage before your marriage. Can i ask what does the wife in china think? What's her opnion, if she did not love him any more, the best way is that he gives her amount of money as a fee for raising the child. But if she did not agree, the issue may be taken into court. It is his fault definitely.