The H-4 visa allows dependent family members of H-2A workers to accompany or join them in the United States. Here are the steps an H-2A employer can take to assist workers’ spouses and children under 21 with obtaining an H-4 visa: Eligibility Requirements To be eligible for an H-4 visa, the applicant must be the spouse or unmarried child under 21 of an H-2A worker 1. The H-2A worker must maintain valid H-2A status while the H-4 visa holder is in the United States 23.