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Laws may also bar marriage between closely related people, which are almost universally prohibited to the second degree of consanguinity. [citation needed] Some jurisdictions forbid marriage between first cousins, while others do not. Marriage with aunts and uncles (avunculate marriage) is legal in several countries. [7] [8]
Several states of the United States prohibit cousin marriage. [1] [2] As of February 2025, 24 U.S. states prohibit marriages between first cousins, 18 U.S. states allow marriages between first cousins, and eight U.S. states (Arizona, Illinois, Indiana, Maine, Minnesota, Tennessee, Utah, Wisconsin) allow only some marriages between first cousins. [3]
The coefficient of relationship is sometimes used to express degrees of kinship in numeric terms in human genealogy. In human relationships, the value of the coefficient of relationship is usually calculated based on the knowledge of a full family tree extending to a comparatively small number of generations, perhaps of the order of three or four.
Can you marry your cousin in South Carolina? Here’s what the law says.
Ever wondered what your mother’s cousin’s son is to you? Or just what exactly “twice removed” means? Here’s a guide to help you find the right term for those complicated family ties.
Marriages between first cousins are legal in 19 states. For premium support please call: 800-290-4726 more ways to reach us
Cousin marriage has often been practiced to keep cultural values intact, preserve family wealth, maintain geographic proximity, keep tradition, strengthen family ties, and maintain family structure or a closer relationship between the wife and her in-laws.
In an uncle–niece or a double first cousin marriage, the couple is assumed to have inherited 1/4 of their genes from a common ancestor, whereas in first cousin unions the assumption is that the couple has inherited 1/8 of their genes from a common ancestor, and for a second cousin couple the comparable proportion is 1/32.