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

The concept of marrying one’s cousin evokes a range of reactions, from curiosity to disapproval. While cousin marriage might be taboo in some cultures, it has been a historically accepted practice in others. Understanding the legality of cousin marriage is important, especially if you are considering such a union. This article delves into the laws surrounding cousin marriage in the state of Washington, examining the regulations, historical context, and potential implications.

Washington State Law on Cousin Marriage

  • Legal Status: In Washington state, it is legal to marry your first cousin. This means that individuals who share a common grandparent are permitted to enter into a legally recognized marriage.
  • Specific Regulations: Washington’s marriage laws do not place any specific restrictions or additional requirements on marriages between cousins. The process of obtaining a marriage license and the legal validity of such a union are the same as for any other marriage in the state.
  • Rationale Behind the Law: The legality of cousin marriage in Washington likely stems from a combination of factors, including:
    • Absence of Strong Scientific Evidence: While there are concerns about the potential for increased genetic risks in offspring of cousin marriages, the actual risk is often considered relatively low in many modern societies.
    • Respect for Individual Choice: The law likely reflects a belief in respecting individual autonomy and the right to choose one’s spouse.

Historical and Cultural Perspective

  • Prevalence of Cousin Marriage in History: Cousin marriage has been a common practice throughout history and across various cultures. In some societies, it was even preferred for reasons such as keeping property within the family or strengthening social alliances.
  • Changing Societal Views: In many Western societies, including the United States, the perception of cousin marriage has shifted over time. While once relatively common, it is now viewed less favorably by some due to concerns about genetic risks and changing social norms.
  • Cultural Influences: In certain cultures, cousin marriage may still hold social or religious significance. It’s important to understand that perspectives on cousin marriage can vary widely based on cultural backgrounds.

Potential Arguments For and Against Cousin Marriage

  1. Arguments in Favor
  • Personal Choice and Freedom: Advocates of cousin marriage often emphasize the right of individuals to choose their partners without undue societal or legal restrictions.
  • Strengthening Familial Bonds: Cousin marriage can be seen as a way of reinforcing close family ties and maintaining traditions within a family.
  • Cultural Traditions: In some cultures, cousin marriage might be a deeply ingrained tradition with religious or social significance.
  1. Arguments Against
  • Potential Genetic Risks: The primary concern surrounding cousin marriage is the potential for increased genetic risks to offspring. Closely related individuals are more likely to carry recessive genes responsible for genetic disorders. However, it’s important to note that the overall risk remains relatively low for most couples.
  • Social Stigma: Cousin marriage can carry a social stigma in some communities, potentially leading to judgment or ostracism.
  • Ethical Considerations: Some individuals raise ethical concerns about the implications of cousin marriage, particularly regarding the power dynamics within families and the potential for pressure or coercion.

Alternatives to Cousin Marriage

  • Recognizing Diverse Relationship Models: It’s important to acknowledge that there are many different ways to build strong and fulfilling relationships. Romantic love is not limited to a narrow definition of family ties.
  • Genetic Counseling: For couples concerned about potential genetic risks, genetic counseling can be a valuable resource. Genetic counselors can assess the specific risks for a couple and provide guidance about reproductive options.


The legality of cousin marriage in Washington state reflects the state’s stance on respecting individual choice and the absence of compelling reasons to prohibit it. While the practice is legal, the decision to marry a cousin is a deeply personal one. It’s essential to weigh the potential benefits, risks, and social implications carefully. Understanding the legal landscape, historical context, and the range of arguments surrounding cousin marriage allows for more informed decision-making.

Important Considerations

  • Genetic Counseling: If you are considering marrying your cousin, it’s highly advisable to seek genetic counseling. This will help you understand the potential risks associated with your specific family history and make informed choices about family planning.
  • Social and Familial Context: It’s crucial to consider the potential impact of your decision on family relationships and social dynamics. Open and honest communication with family members can be beneficial.
  • Personal Beliefs and Values: Ultimately, the decision of whether or not to marry your cousin should align with your personal beliefs, values, and priorities.


  • Washington State Legislature: – Provides information on marriage laws in the state.
  • National Society of Genetic Counselors: – Offers resources and information on genetic counseling services.
  • Research Articles and Studies: There are various academic studies and articles exploring the genetic risks associated with cousin marriage. A few reputable sources you may want to consider include: * Bennett, R. L., Motulsky, A. G., Bittles, A., Hudgins, L., Uhrich, S., Doyle, D. L., … & Knowles, M. R. (2002). Genetic counseling and screening of consanguineous couples and their offspring: recommendations of the National Society of Genetic Counselors. Journal of genetic counseling, 11(2), 97-119.*
    • Hamamy, H. (2012). Consanguineous marriages: Preconception consultation in primary health care settings. Journal of community genetics, 3(3), 185-192.*

Disclaimer: This article provides general information on the topic of cousin marriage in Washington state. It does not constitute legal or medical advice. Consult with qualified professionals for personalized guidance on your specific situation.

Avatar photo
MBS Staff
Articles: 5279

Leave a Reply

Your email address will not be published. Required fields are marked *