Does an immigrant visa entitle me to U.S. citizenship immediately?
No. An immigrant visa only gives you to obtain permanent residence in the U.S. and receive a green card. Filing for U.S. citizenship is another process. You and/or your family members can file for U.S. citizenship after five years of permanent residence in the U.S. After gaining U.S. citizenship, you are then allowed to sponsor and bring your parents to the U.S.