Our expert says:
Given that they are identical, the chances are great that they would have similar problems, unless your husband sustained an injury to his groin at some point. Don't take any rash steps, have both of you checked out and exhaust all options first. If his brother were for some reason able to produce viable semen and your husband not, and assuming your husband agreed to this, you don't have to have sex with him anyway! As with women who have artificial insemination, you could obtain semen samples from him and have your husband insert them whilst being intimate. You would need medical advice as to how you do this to keep the sperm alive etc. but it is possible and probably the better option from a relationship perspective.
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