Sibling? Cousin? In-law? How close is too close for a marriage-based green card?

Key takeaways

• Marriage to a U.S. citizen does not make anyone a citizen right away — a genuine, legally valid marriage is only the first step toward a green card.
• Marriages between close blood relatives, such as siblings or parent and child, are prohibited under state law and are generally not recognized for immigration purposes.
• First-cousin marriages are treated differently from state to state — Florida's prohibited-marriage law does not list first cousins, while Arizona generally prohibits them, with narrow exceptions.
• Entering a marriage to evade immigration law is a federal crime, punishable by up to five years in prison and a fine of up to $250,000.
• There is a legal way to bring a brother or sister to the U.S.: the F4 family-preference category, available to U.S. citizens aged 21 or older.

Marriage does not make anyone a citizen right away

A legally valid, genuine marriage to a U.S. citizen may be the first step toward a green card — nothing more. Citizenship can come later. If the spouse is a U.S. citizen, a green-card holder may be able to apply for citizenship after three years if they meet the requirements. Most other green-card holders use the five-year route.

How close is too close?

The answer depends on the exact relationship and on state law:

• Parent or sibling: generally prohibited from marrying.
• First cousin: state rules differ. Florida's prohibited-marriage law does not list first cousins; Arizona generally prohibits first-cousin marriages, with narrow exceptions.
• Brother-in-law or sister-in-law: a different situation, because it is not a blood relationship. The exact relationship and state law still matter.

Would the marriage count for immigration purposes?

USCIS generally looks to the law of the place where a marriage took place — but that is not the end of the inquiry. Its policy guidance says marriages that violate U.S. public policy may not be recognized for immigration purposes, and it identifies incestuous marriages as generally contrary to that policy. The Department of State also flags marriages involving biological relatives, including siblings, for legal review when their validity is in question.

State law matters, too. Arizona law says marriages between brothers and sisters — including half-siblings — are prohibited and void. Florida law also prohibits a person from marrying their brother or sister.

So a marriage certificate from another jurisdiction does not, by itself, guarantee that U.S. immigration authorities will treat the couple as spouses. The answer can depend on where the marriage took place, where the couple lives, and the exact family relationship.

What if the marriage is only for immigration benefits?

A marriage-based petition must involve a bona fide marriage. Federal law makes it a crime for anyone to knowingly enter into a marriage to evade immigration law. The penalty can include up to five years in prison, a fine of up to $250,000, or both.

A close family relationship alone does not prove that a marriage was fraudulent, and USCIS states that failing to show a bona fide marriage does not, by itself, establish fraud. But if the government determines that a person previously entered — or attempted or conspired to enter — a marriage to evade immigration law, federal law can prevent approval of later immigrant petitions for that person.

The legal way to sponsor a brother or sister

Yes, there is a direct path. A U.S. citizen who is at least 21 may petition for a brother or sister through the family-based immigration system. This is the F4 family-preference category, so it is capped and subject to visa availability — waits can be long. A lawful permanent resident cannot petition for a sibling through the family categories listed by the Department of State.

The takeaway

A marriage to a close relative should never be treated as a way around the normal family-immigration rules. The marriage's validity and the couple's intent are separate legal questions, and either can prevent a spouse-based petition from succeeding. Anyone considering a petition involving a close family relationship should get case-specific legal advice before filing.

This article provides general information and is not legal advice.

How Jessica can help

Jessica Weiss, Esq. has practiced U.S. immigration law since 1998, handling marriage-based green cards, sibling petitions, and the full range of family immigration. If you are unsure whether a relationship or a marriage will be recognized, she can review your specific situation before you file.