The answer depends on whether you are a permanent resident (green card holder) or a U.S. Citizen. U.S. Citizens can sponsor additional family members that green card holders cannot sponsor. Additionally, U.S. Citizens can petition for a fiance/fiancee to come to the U.S. to be married, while a green card holder is not given the same privilege. The person filing the petition is called the Petitioner. The person you are filing for is called the Beneficiary.

What is the difference between an Immediate Relative and Preference Relative?

An immediate relative has an immigrant visa (green card) immediately available to them. An immediate relative does not have to wait for an immigrant visa number to be available. Once a visa petition is filed for an immediate relative and the petition is approved by USCIS, the visa will be immediately available. The wait involved for an immediate relative is due to the green card processing time. In contrast, a preference relative does not have the benefit of an immediately available immigrant visa number. A preference relative must wait for a visa number to become available which can be several years, even more than a decade in some circumstances. The preference categories and current average waiting periods are outlined below:

The wait times are determined by checking current priority dates. The U.S. Department of State posts the priority dates, monthly in a chart called the Visa Bulletin. The posted wait times can change from month to month. Countries such as Mexico, India and the Philippines have longer waiting times since the demand for immigrant visas are higher than in other countries.

Make sure you also read the February 2009 update on this post, it has information from the State Department Visa Bulletin.