Spouse and unmarried children (under the age of 21) can join the main applicant by applying the dependent visa β H-4 visa. Once a child turns 21 years of age, the child will need to apply for another visa to remain in the US.
H-4 visa holders are not permitted work. However, H-4 spouse may apply for a work permit by filing Form I-765 if the H-1B visa holder meets one of the following requirements:
π Be the beneficiary of an approved Form I-140
π Extended H-1B visa beyond the usual 6 year maximum in 1 year increments on a Perm Labor Certification (LC) or filed Form I-140 for H-1B beneficiary at least 365 days prior to the end of the 6 year H-1B visa