Is It Illegal to Marry Your Cousin in Michigan? Here's What the Law Says

Marrying your cousin in Michigan is not permitted under state law. Specifically, first cousins are not allowed to marry each other in Michigan.

Marriages between first cousins are considered void from their inception, meaning they are legally invalid and cannot be recognized by the state.

However, sexual relations and cohabitation between first cousins are legal in Michigan, as long as both parties are consenting adults and not otherwise barred by laws regarding age or mental capacity.

It is also worth noting that marriages between first cousins once-removed are allowed—meaning, for example, a person could marry a cousin’s child.

In summary:

First cousin marriage: Not allowed (void under Michigan law)
First cousin once-removed marriage: Allowed
Sexual relations and cohabitation between first cousins: Allowed (if both are consenting adults)

If first cousins were to marry in another state where it is legal, Michigan may recognize such marriages depending on the circumstances, but this is a complex legal issue and not guaranteed. For most practical purposes, first cousins cannot legally marry in Michigan.

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