Foreigners can obtain Permanent Residency (Green Card) through family members who are U.S. citizen or permanent residents. If the petitioning individual is a permanent resident, the beneficiaries are limited to a spouse and unmarried children. Especially, it is not possible for a permanent resident to invite his or her parents.
Below are the categories of family based immigration:

1. Immediate Relatives of U.S. Citizens

   Citizen’s spouse, children under the age of 21 or parents

2. Family First Preference

   Citizen’s unmarried child/children

3. Family Second Preference)

   Permanent Resident’s Spouse or unmarried child/children

4. Family Third Preference

   Citizen’s Married Child/Children

5. Family Forth Preference

   Citizen’s Brothers/Sisters