The Genetic Risks of Marrying a Cousin in California—Facts vs. Fears



Concerned about birth defects from marrying a cousin? Here’s what the science actually says—and why California doesn’t ban cousin marriage.

What Are the Genetic Risks?

The risk of birth defects from first-cousin marriages is slightly elevated, but not dangerously high:

RelationshipRisk of Birth Defects
Unrelated Parents~3–4%
First Cousins~5–6%

According to medical studies, cousin marriages may double a small baseline risk—but it's not significant enough to warrant a legal ban.

Why the Law Doesn’t Intervene

  • Genetic screening is available to couples

  • Freedom to marry is constitutionally protected

  • The state trusts adults to make informed decisions

Should You Worry?

It depends on your family history. A genetic counselor can offer personalized insights and recommend testing before having children.

📞 Have questions?
👉 Schedule a consultation with our legal team

📌 Or read the legal breakdown here:
👉 Main Article – Is It Legal to Marry Your Cousin in California?

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