NOT very. It’s so dangerous I can’t even explain it to you. My family used to be friends with a family, the parents are married first cousins. 4 out of 8 of their children were born with a genetic disease, and 3 of those 4 have passed away. The 4th is sick but bH doing pretty well. The gene pool is just to familiar and small with cousins marrying, it is not healthy.
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