That will depend on why the USCIS denied your wife's petition. If the USCIS believed that your marriage is not bona fide, then her petition for your son will be denied, too. If her I-130 for you has been approved but your adjustment of status is denied due to your personal issues, such as illegal entry, crimes, etc, then she can petition for your son. Please note that you son mustenter the US legally in order to adjust his status unless he is 245i protected.
Answered on Sep 19th, 2011 at 5:43 AM