You did not say why your husband's petition was denied; it is very important. Most often, denial of a spouse's petition means that USCIS does not believe that the marriage is real. Such determination carries brutal consequences, and you have to fight it, if necessary, all the way to the federal court. In any case, whatever the reason USCIS denied your husband's petition for you, it will equally apply to his petition for your son: if your marriage is fake, then the relationship between your husband and your son does not exist; if your husband is not eligible to petition the government for your immigration, then he is not eligible to sponsor your son; etc. And you cannot file a petition for your son because you have no status. In short, you should have an immigration attorney look at your case and figure out how to deal with the denial of your husband's petition for your green card. It has to be done as soon as possible because any legal action in this kind of situation has to be done within a very short period of time, usually, within 30 days from the date of the denial.
Answered on Sep 30th, 2015 at 8:54 PM