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AnswerAll I can say is the baby has and INCREASED chance of being born with a genetic disease. The baby will not necessarily be "mentally handicapped".

If a disease (such as Diabetes) runs in your family, the baby will inherit these genes from both the mother and father and probably suffer from it. A normal child has only one chance of getting it.

Children that are mentally handicapped are not because of genes, but because there was a trauma - a bad birth, or something going wrong in the womb.

Most children born from incestuous relationships are fine. If you have a child on the way, try not to worry. If you are looking at conceiving a child - please don't. Think of the child's life growing up knowing it's parents are closely related?

"Children that are mentally handicapped are not because of genes, but because there was a trauma - a bad birth, or something going wrong in the womb. "

This is not true. While some children have mental retardation as a result of birth trauma there are plenty of genetic syndromes that cause mental retardation as well.

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Q: What are the odds of a baby being born mentally handicapped if its parents are half brother and sister?
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