It is certainly not ossur d’Oraisah for even first cousins to marry. It might not be a good idea when there is a hereditary disorder in the family that could potentially be passed on to the children, when family members marry each other. If the gene pool has an inyan, it is safer not to do this. Otherwise – why not? I would go to Dor Yesharim and have both tested, as with any shidduch precaution.
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