F4 — Sibling of citizen immigration law firms

About the F4 category

The F4 family fourth-preference category lets adult U.S. citizens petition for their brothers and sisters, with the sibling's spouse and minor children eligible as derivatives. It is the most backlogged of all the family categories, with waiting times measured in many years and varying significantly by country of birth. Because the timeline is so long, early and accurate filing is genuinely valuable — the priority date is set when the I-130 is filed. Families also need to plan for derivative children who may age out during the wait and for documenting the sibling relationship, which can require older or foreign civil records.

Who the F4 category is for

  • You are a U.S. citizen petitioning for a brother or sister.
  • The sibling's spouse and minor children qualify as derivatives.
  • The most backlogged family category — file early to lock the priority date.

How the process works

How a family case unfolds: the U.S.-citizen or permanent-resident relative files an I-130 petition that proves the family relationship. For immediate relatives there is no visa-number wait; for the preference categories, the family then waits for the priority date to become current in the monthly Visa Bulletin. Once a visa is available, the relative abroad completes consular processing through the National Visa Center and a U.S. embassy interview, or — if already lawfully in the United States — files for adjustment of status. An affidavit of support is required to show the household can financially sponsor the immigrant, and a medical examination and background checks complete the case.

Common F4 pitfalls

A handful of avoidable problems account for most setbacks in these cases — nearly all of them easier to fix before filing than after:

  • Filing late — the priority date set at filing is everything here.
  • Derivatives aging out before a visa becomes available.
  • Proving the sibling relationship with older foreign birth records.

Related family options

Not sure the F4 is the right fit? These related routes are worth comparing:

When a law firm helps most

A firm's depth is genuinely useful for F4 cases: more hands for document-heavy filings, redundancy so a deadline is never missed, and experience spread across categories when a case has more than one moving part. For companies sponsoring workers, that capacity — and the compliance support that comes with it — is often the deciding factor between a firm and a solo practitioner.

What to look for in a firm

When you compare the firms above, weigh:

  • Relevant caseload — a firm that files matters like yours regularly, not just occasionally.
  • Team and capacity — enough attorneys and paralegals to meet deadlines without bottlenecks.
  • A clear point of contact — someone named who owns your file and keeps you updated.
  • Languages you speak — so nothing is lost between you and your case.
  • Transparent pricing — flat or clearly explained fees, agreed before the work begins.

Solo attorney or law firm?

Whether a firm or a solo lawyer fits a F4 cases depends on the case: firms bring a team and capacity for complex or high-volume matters, while a solo attorney often means a closer working relationship and lower cost on simpler filings. Compare both on Immigrantio — or switch to our immigration lawyers if an individual attorney is what you want.

Why use Immigrantio

On Immigrantio you can compare verified U.S. immigration law firms who handle F4 cases side by side. Each profile shows the attorney's experience and practice focus, the languages they speak, honest reviews from past clients and transparent consultation pricing — everything you need to build a shortlist and reach out with confidence rather than picking a name from a search results page. Every listing is Bar-verified, and you work with the lawyer directly.

Start with a consultation: most immigration law firms above offer a video or phone call and respond within a day or two. A short first conversation is the quickest way to turn uncertainty into a concrete plan for your case.