This is the information from instructions for form I-130
If you are a U.S.citizen you must file a separate Form I-130 for each eligible relative. You may file a Form I-130 for:
A. Your husband or wife;
B. Your unmarried child under age 21;
C. Your unmarried son or daughter age 21 or older;
D. Your married son or daughter of any age;
E. Your brother(s) or sister(s) (you must be age 21 or older);
F. Your mother or father (you must be age 21 or older).
2. If you are a lawful permanent resident of United States, you may file this form for:
A. Your husband or wife;
B. Your unmarried child under age 21;
C. Your unmarried son or daughter age 21 or older.
Or you can check the types of immigrant visa available here
http://www.uscis.gov/portal/site/us...nnel=ca408875d714d010VgnVCM10000048f3d6a1____
Keep in mind that different categories differ in the time between application and when they can come to the USA. Spouses, unmarried children under 21, and parents of a USC fall under the immediate relative (IR) category and do not have to wait for a visa number.