Your brother or sister does not need to apply for a work permit once they are admitted as an immigrant with their immigrant visa or have already been approved for adjustment to permanent resident status. If your brother or sister is now outside the United States, they will receive a passport stamp upon arrival in the United States. This stamp will prove that they are allowed to work until a Permanent Resident Card is created.

If your brother or sister is in the U.S. and has applied to adjust to permanent resident status (by filing USCIS Form I-485, Application to Register Permanent Residence or Adjust Status), they are eligible to apply for a work permit while their case is pending. Your brother or sister should use Form I-765 to apply for a work permit.