我没错呀

绿卡人士可以给some relatives申请绿卡，这some relatives 指的是配偶和子女，不包括父母。（ Those relatives are your spouse and children, regardless of age.）
请参看USCIS的说明的这一段：
Relatives
A Permanent Resident can petition for some relatives to join him or her in the United States as immigrants. Those relatives are your spouse and children, regardless of age. See our page on "Immigration through a Family Member". 链接如下：

http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=fe17e6b0eb13d010VgnVCM10000048f3d6a1RCRD&vgnextchannel=4f719c7755cb9010VgnVCM10000045f3d6a1RCRD