My grandparents were 1st cousin...nothing wrong with cousins marrying. No birth defects in any of the children...there were 7
One web-site I found some time back indicated that divorce rates of cousin marriages were lower than non-cousin.
Here is some info found on the internet:
Some people are fixated on the fallacy that cousin couples pose an intolerable risk to their offspring. However it is likely that we are all descendants of cousin marriages. Before civil laws banning cousin marriages, it was preferable to marry a cousin in some communities as it is to this day in many countries. The notion “why marry a stranger" is just as prevalent in many countries as the cousin marriage taboo in America today.
There is a wide range of opinions on the subject of cousin marriages. This is fuelled by erroneous information, bigotry, and presumptions. Further we have civil laws and religious creeds based on obsolete information.
The facts about cousin marriages are much clearer.
There are no contemporary studies that indicate cousins have children with significantly higher than normal birth defects. Fears of cousins who marry having children with birth defects are indeed exaggerated. Simply marrying within your own race increases the odds of birth defects. Marrying within your own town further increases your chances. Cousin couples have only a slightly higher incidence of birth defects than non-related couples.
Fact: 26 states allow first cousin marriages; Most people can marry their cousin in the US.
Fact: US prohibitions against cousin marriages predate modern genetics. Hmmm.
Fact: In the first quarter of 2000, two delegates in Maryland introduced a bill that would prohibit first cousin marriage. This bill passed in the House of Delegates (82 to 46), however did not make it past the Senate Committee. Please remember Delegates Heller and Barve in the next election. The sponsors of the bill claim that a large ratio of out-of-state couples come to Maryland to get married – perhaps cousin couples. Their bill would have stifled revenues from marriage licenses while imposing ridiculous marriage restrictions.
Fact: No European country prohibits marriage between first cousins. It is also legal throughout Canada and Mexico to marry your cousin. The USA is the only western country with cousin marriage restrictions.
Fact: 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.
Fact: 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.
Fact: The frequency of cousin marriages in the USA is about 1 in 1,000
Fact: The frequency of cousin marriages in Japan is about 4 in 1,000
Fact: 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!
Fact: In some cultures, the term cousin and mate are synonymous.
Fact: The range of consanguinity in Saudi Arabia is between 34 to 80+ percent. A study has been done on birth defects resulting from consanguineous marriages in this country. Read about it.
Fact: Albert Einstein married his first cousin. And so did Charles Darwin, who had exceptional children.
Fact: Franklin D. Roosevelt, the longest serving US president in history married his cousin (not a first cousin, however they shared the same last name).
Fact: The first Prime Minister of Canada, Sir John A. MacDonald married his first cousin. Fact: Leviticus 18 lists all forbidden sexual relationships. Cousin relationships are not included.