NO, you cannot apply for anyone other than spouse and children as a green card holder. Additionally, even once you become a US citizen, the only members of your family that will be able to adjust status within the US will be your parents and any children under the age of 21. Siblings, although they may have entered the US lawfully, now that they have overstayed, are not eligible to adjust status within the US except on the basis of an immediate relative petition which would be a petition filed by a child, spouse or parent for child under 21.
Answered on Oct 02nd, 2012 at 10:08 PM