http://www.uscis.gov/portal/site/us...nnel=1d383e4d77d73210VgnVCM100000082ca60aRCRD Family of a USC.
http://www.uscis.gov/portal/site/us...nnel=b8c93e4d77d73210VgnVCM100000082ca60aRCRD Siblings....
If a family member of your sibling does not "accompany" at the same time (like if it too expensive to bring everyone all at once), they might be able to come afterwards.
Following-to-Join Benefits [From 2nd link]
This section is for beneficiaries who became permanent residents through a preference classification.
If you were married and/or had children who did not obtain permanent residence at the same time you did, they may be eligible for follow-to-join benefits. This means that you do not have to submit a separate Form I-130 for your spouse and/or children. In addition, your spouse and/or children will not have to wait any extra time for a visa number to become available. In this case, you may simply notify a U.S. consulate that you are a permanent resident so that your spouse and/or children can apply for an immigrant visa.
Your spouse and/or children may be eligible for following-to-join benefits if:
The relationship existed at the time you became a permanent resident and still exists, AND
You received an immigrant visa or adjusted status in a preference category
If your family member falls into this category and you adjusted to permanent residency in the United States, you may submit the following:
Form I-824, Application for Action on an Approved Application or Petition
A copy of the original application or petition that you used to apply for immigrant status
A copy of Form I-797, Notice of Action, for the original application or petition
A copy of your Form I-551 (green card)
If you are in the United States and have not yet filed to adjust your status to permanent resident, you can file Form I-824 for your spouse and/or child overseas with your Form I-485. When concurrently filing Form I-824, it does not require any supporting documentation.
If you received the immigrant visa overseas, you may contact the National Visa Center (NVC) for follow-to-join information. Send your inquiry by e-mail to
NVCInquiry@state.gov or by writing to the National Visa Center, ATTN: WC, 32 Rochester Ave., Portsmouth, NH 03801-2909.
To download the forms and instructions mentioned above, see links in the “Forms” section to the right.