Dna among generations

1 year 2 months ago #825 by Jess
Dna among generations was created by Jess
I have a question. What do you think about a family who had practiced marrying only their first cousins ,( mothers nephews/ nieces , fathers nephews / nieces ) for hundreds of years marrying only the first cousin? I want to know the Health repercussions . Currently my sister and a few more are labeled as infertile.
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