Could I have an application form? http://ghettotube.in.net/ ghettotube.com If the beneficiary of a family petition marries, divorces or turns 21, that changes the category for which qualifies for permanent residence. But, they remain eligible in a new category provided that a category exists for them. In your case, when you became a U.S. citizen, your sonÃ¢ÂÂs case moved from the second family preference category for the spouse and children of permanent residents to the first preference for the unmarried children 21 or over of U.S. citizens. If he marries, he will become eligible in the third family preference for the married children of U.S. citizens. If he had married while you were still a permanent resident, the petition would have become void. ThatÃ¢ÂÂs because no category exists for the married sons and daughters of permanent residents.