Are Second Cousins Blood Relatives

Second cousins are still relatives. A second cousin is a first cousins child. You all still have the same blood running through each other's veins. Some people think second cousins are ok to date, marry and even have kids. I think it's nasty and should be against the law. It's also been said that if second cousins have children they come out retarded. I think the blood lines have nothing to do .
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