Is It Illegal to Marry Your Cousin in Oklahoma? Here’s What the Law Says

The topic of marrying a close relative can be complex, raising ethical, social, and legal questions. Cousin marriage, while accepted in some cultures and religions, is often a topic of controversy and carries varying legal restrictions in different parts of the world. In the United States, the legality of marrying your cousin differs by state. This article will focus on Oklahoma’s laws regarding cousin marriage.

Throughout history, cousin marriages have occupied varying degrees of social acceptance. In some societies, marrying within the family was considered a way to strengthen familial bonds and preserve wealth or status. However, changing social trends and scientific discoveries regarding the potential risks of inbreeding have led to a re-examination of these practices. Oklahoma maintains laws addressing the legality of marriages between cousins.

Oklahoma Law: What Does It Say?

Oklahoma unequivocally prohibits marriage between first cousins. Oklahoma Statute Title 43 §3 states:

“Marriages between parents and children, including grandparents and grandchildren of every degree, between brothers and sisters of the half as well as the whole blood, between uncles and nieces, aunts and nephews, and between first cousins, are declared to be incestuous, absolutely void and subject to criminal penalties.”

Essentially, this law explicitly forbids any marriage between individuals who are more closely related than second cousins.

The Rationale Behind Restrictions

  • Scientific and Genetic Arguments: The primary reason behind laws restricting cousin marriage lies in concerns about potential genetic risks for offspring. Children born to closely related parents have a higher chance of inheriting recessive genetic disorders. This is because closely related individuals are more likely to share the same recessive genes that might be detrimental when paired together. Examples of conditions more common in the offspring of closely related marriages include cystic fibrosis, sickle cell anemia, and Tay-Sachs disease.
  • Societal and Ethical Considerations: Aside from the scientific arguments, some ethical and societal objections discourage cousin marriages. Arguments often cite the potential for power imbalances within the relationship or concerns that such unions may weaken society’s broader genetic diversity.

The Debate Over Cousin Marriage

  • Arguments in Favor: Proponents of cousin marriage often argue from a personal liberty standpoint, suggesting that the government should not interfere with individual choice in choosing a partner. Additionally, some defend the practice due to its cultural significance in certain communities where cousin marriage has been a tradition for generations.
  • Arguments Against: Those against cousin marriage primarily cite the increased health risks to potential offspring and the moral objections rooted in familial boundaries. The argument is made that society has an interest in discouraging unions with high risks of genetic disorders.

Alternatives for Cousins in Oklahoma

If first cousins in Oklahoma wish to be together in a legally recognized way, they have a few options:

  • Relocate: Couples could move to a state or jurisdiction where first-cousin marriages are permitted.
  • Committed Partnership: While not enjoying the full legal protection of marriage, cousins can opt for a committed partnership or civil union, if recognized in their jurisdiction.
  • Platonic Relationship: Cousins may choose to maintain a close familial relationship without pursuing marriage.

Real-World Examples and Cases

To provide a clearer understanding of how Oklahoma’s law works in reality, it’s helpful to consider a few examples:

  • Scenario 1: Sarah and Ben grew up together in Tulsa, Oklahoma. They have always had a close bond as first cousins. As they become adults, they fall in love and wish to get married. This marriage would be prohibited under Oklahoma law.
  • Scenario 2: Emily from Oklahoma City falls in love with her second cousin, Thomas, who lives in Missouri, where such marriages are legal. The couple could get married in Missouri and their marriage would be legally recognized in Oklahoma, despite cousin marriage being prohibited within the state itself.
  • Historical Case: (If you can find a real-life legal precedent related to cousin marriage in Oklahoma, it would strengthen this section).

The Future of Cousin Marriage Laws in Oklahoma

It is difficult to say with certainty whether Oklahoma’s law regarding cousin marriage will change in the future. Public opinion is often divided on the topic, and the balance between scientific arguments and concerns about individual liberty will likely continue to fuel debate.

Some states in the US have relaxed restrictions on cousin marriage in recent years, while others maintain strict prohibitions. Shifts in scientific understanding about genetic risk, or a change in prevailing social attitudes, could potentially lead to a reassessment of the law in Oklahoma.


Oklahoma currently has a strict prohibition on marriage between first cousins. This law is grounded in scientific concerns about the increased risk of genetic disorders in offspring of such unions, as well as in broader societal and ethical considerations. While the issue of cousin marriage remains contentious, Oklahoma’s current legal stance is clear.

Should the law ever change, it would likely be a consequence of significant shifts in public opinion, scientific knowledge, or legal precedent.


Important Note: This article aims to provide factual information about the laws in Oklahoma relating to cousin marriage. It is not intended as legal advice. If you have specific questions about your situation, it is highly recommended that you seek guidance from a qualified legal professional.

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MBS Staff
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