You can find out more about family law in your own state by contacting a legal services office, a law school that offers legal services to students and the public, or searching your state's homepage on the internet. In the U.S., some states legally forbid first cousins from marrying, some require genetic counseling before legal union can take place, and other states require proof that at least one potential spouse is infertile. Legally, you can date and be intimate with your first cousin, but if you are considering marriage, laws vary by state and country. Experts say 1 out of 4 such children will have some sort of disorder. If cousin couples happen to be carrying known genetic diseases, the risks faced by their offspring can jump. First cousins are two-times more likely to bear offspring with a birth defect than children born of couples who don't share a common grandparent. Newborns with genetic disorders such as spina bifida or cystic fibrosis are more likely to be born of blood relatives because previously unexpressed recessive genes are more likely to appear. Negative reactions to cousins who pair off stem largely from the belief that children from such relationships may have physical and/or mental abnormalities.
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