2. US prohibitions against cousin marriages predate modern genetics.
3. No European country prohibits marriage between first cousins. It is also legal throughout Canada and Mexico to marry your cousin. The U.S. is the only western country with cousin marriage restrictions.
4. Children of non-related couples have a 2-3% risk of birth defects, as opposed to first cousins having a 4-6% risk. Genetic counseling is available for those couples that may be at a special risk for birth defects (e.g. You have a defect that runs in your family) In plain terms first cousins have at a 94 percent + chance of having healthy children. Check the links section for more information on genetic counselors. The National Society of Genetic Counselors estimated the increased risk for first cousins is between 1.7 to 2.8 percent, or about the same a any woman over 40 years of age.
5. Second cousins have little, if any increased chance of having children with birth defects, per the book "Clinical Genetics Handbook�� courtesy of the March of Dimes.
6. The frequency of cousin marriages in the USA is about 1 in 1,000. The frequency of cousin marriages in Japan is about 4 in 1,000
7. It is estimated that 20 percent of all couples worldwide are first cousins. It is also estimated that 80 percent of all marriages historically have been between first cousins!
8. In some cultures, the term cousin and mate are synonymous.
9. Albert Einstein married his first cousin. And so did Charles Darwin, who had exceptional children.
10. Franklin D. Roosevelt, the longest serving US president in history married his cousin (not a first cousin, however they shared the same last name).
11. Leviticus 18 lists all forbidden sexual relationships. Cousin relationships are not included.
12. God commanded many cousins to marry, including Zelophehad's 5 daughters, Eleazar's daughters, Jacob (who married both Rachel and Leah, first cousins), and Isaac and Rebekkah (first cousins once removed)
13. It is likely that Joseph and Mary -- Christ's earthly parents were first cousins.
14. Current studies indicate that cousin couples have a lower ratio of miscarriages -- perhaps because body chemistry of cousins is more similar. The verdict is still out.
15. We are all cousins. No two people are more distantly related than 50th cousins.
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