Is marriage to a relative by affinity legal in the us?

my fiance is my sister's brother-in-law, which means that technically, we are relatives by affinity. and we plan to get married in december in california. my question is will our marriage be valid? or is there any us federal law that forbids that? thanks for your answers.Is marriage to a relative by affinity legal in the us?
No, go for it! (Only blood relatives cannot marry, and the degree is determined by state law)Is marriage to a relative by affinity legal in the us?
Marriage laws typically prohibit marriage of first cousins.





Marriage laws differ on a state-by-state basis.





California law will not prohibit your marriage.
There shouldn't be a problem with that. It is blood relatives that they frown upon, but if you go to Tennessee you can marry your first cousin.





I know of several instances where two sisters married two brothers... (sisters one family, brothers from another)
Personally, I don't see how it could be an invalid marriage. If you were first cousins or something like that, it would be different.
The marriage laws go by blood relation only. If there is no blood relation you can marry anyone you want. The law uses blood because any children you might have could possibly have birth defects if you are related by blood.

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