California residents who are U.S. citizens and who wish to bring spouses, unmarried children under 21 or parents from a foreign country to the United States can do so under certain conditions. Those individuals can get a visa number immediately, but some other family members may be able to do so as well. Children who are married or over the age of 21 as well as siblings may also be able to get a green card.
The difference for these types of relatives is that they may have a waiting period before they can obtain a visa because the government only permits a certain number in this category to immigrate per year. This process can begin outside the United States or after an individual has arrived in the United States.