Texas did pass a ban on first-cousin marriage the same year as Amrhein and Andrews married, evidently in reaction to the presence of the polygamous FLDS.
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[Related: ] Ultimately, marrying your first cousin carries some risk.
Fifth, and finally, I feel like you should be more educated before you post a comment like that.
If they were any more closely related, they would be siblings.
There are two possibilities and they are brothers.