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

The topic of marrying one’s cousin has been a subject of debate for centuries. Some cultures have long-standing traditions of cousin marriage, while others view it as taboo or even illegal. The legality of cousin marriage varies from state to state within the United States. So, where does Hawaii stand on this issue?

Hawaii’s Stance on Cousin Marriage

In Hawaii, it is legal for first cousins to marry. The state does not prohibit marriage between blood relatives closer than first cousins, meaning marriages between aunts/uncles and nieces/nephews or between siblings are illegal.

Historical and Cultural Background of Cousin Marriage

  • Prevalence in History: Cousin marriage has been a common practice throughout history and across various cultures. In some societies, it was even preferred for reasons of maintaining family ties, consolidating wealth, or ensuring political alliances.
  • Royal Lineages: European royalty often engaged in cousin marriages to solidify power and keep bloodlines “pure.” Famous examples include Queen Victoria and Prince Albert, who were first cousins.
  • Religious Influence: Various religions have differing views on cousin marriage. Some faiths explicitly ban it, while others allow or even encourage the practice.

Scientific Considerations: Genetic Risks

  • Increased Risk of Recessive Disorders: Children born from closely related parents have a higher chance of inheriting recessive genetic disorders. This is because close relatives share more genes, increasing the likelihood that both parents will carry a recessive gene for the same disorder.
  • The Magnitude of Risk: While the risk of genetic disorders is higher for children of cousin marriages, the absolute risk remains relatively low for most couples. Studies suggest an increased risk of approximately 2-3% compared to the general population.
  • The Importance of Genetic Counseling: Couples considering cousin marriage are strongly advised to undergo genetic counseling. This can help assess individual risks and provide information for informed decision-making.
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Arguments For and Against Cousin Marriage

Arguments in Support

  • Personal Liberty: Proponents of cousin marriage argue that consenting adults should have the freedom to marry whomever they choose, regardless of familial ties.
  • Cultural Tradition: In some cultures, cousin marriage is deeply rooted in tradition and holds important social significance.
  • Strengthening Family Bonds: It is sometimes considered a way to reinforce existing family connections and keep resources within the family.

Arguments in Opposition

  • Concerns about Genetic Health: The primary argument against cousin marriage centers on the potential increased risk of genetic disorders in offspring.
  • Social Stigma: In many Western societies, cousin marriage carries a social stigma and may be viewed as taboo.
  • Ethical Concerns: Some individuals question the ethics of potentially causing harm to offspring by knowingly increasing their risk of genetic disorders.

State-by-State Comparison

The legality of cousin marriage in the United States paints a complex picture:

  • States Permitting Cousin Marriage: The majority of US states allow first-cousin marriage.
  • States with Restrictions: Some states have bans on cousin marriages, while others have specific laws that might include conditions like age requirements or the need for genetic counseling.
  • Changing Landscape: Public views on cousin marriage are evolving, which could potentially lead to future changes in legislation across different states.


The legality of cousin marriage in Hawaii reflects the permissive stance adopted by many US states. While it is a legal option, the decision to marry a cousin raises significant personal, ethical, and medical considerations. It’s critical for couples to weigh the potential benefits against the possible risks, including the increased chance of genetic disorders in children. Seeking genetic counseling is essential for any couple considering cousin marriage.

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