Introduction To The K-4 Visa

Similar to the K-1 visa, K-3 also has a derivative and this is no other than the K-4 visa. For clarity, the K-3 visa is issued to foreign spouses of US citizens. As mandated by the provisions of the Legal Immigration Family Equity (LIFE) Act, their children or dependents may also enter the United States via its derivatives, which is the K-4 visa.
Overview of the application process
When applying for the K-4 visa, dependents should be unmarried. The failure to comply with this condition prohibits them from availing the benefits of the derivative. Another thing that should be remembered is that the US petitioner must carefully include the dependents in the K-3 visa application. The approval of the said visa signals that the unmarried children may now join their parent in entering the United States.
Meanwhile, in the event wherein the dependent marries long before the K-4 visa is issued, it will automatically make the applicant ineligible for the said visa. The expiration commences 30 days after the marriage.
On the other hand, if the dependent cannot immediately join the K-3 visa holder and decides to follow later, entry to the United States should be performed within a year. If such condition is not satisfied, separate petitions should be filed and the benefits of the K-4 visa is forfeited.
If both the K-3 and K-4 visa holders are already in the United States, the two must apply for an adjustment of status immediately since this process is a step away from obtaining permanent residency.
Documentary requirements
Both the K-3 and K-4 visa applicants are required to submit the following documents during the interview:

Accomplished application form
Valid passport
Birth certificate
Marriage certificate
Death certificates, annulment and divorce papers (applies to those that have previous marriages)
Results of the medical examination
Proof of financial support
Recent photos
Proof of relationship with the US spouse
Evidence of fee payment

Expediting the visa application process could be done via seeking expert assistance from immigration lawyers and other legal professionals. Their knowledge and experience in handling such matters contribute to increasing approval chances and minimizing the waiting period.