I'm assuming that most marriage laws still prevent siblings and other first degree relatives from marrying, even if they're a half sibling. Some modern day philosophers believe heterosexual sibling sex is fine, as long there is use of a pill and a condom. The prohibition of sibling marriage/sex is all based on heterosexual behavior, because of child may be produced from a brother/sister relationship or an uncle/niece relationship.
Baylor geneticists warn procedure can detect incest, raise ethical issues
In a letter in the British medical journal The Lancet today, Baylor College of Medicine geneticists advise hospitals to begin grappling with the issues that arise from the testing, which can unexpectedly show a patient was conceived through so-called "first-degree" familial relationships — father-daughter, mother-son or brother-sister.
Tests showing 25 percent of identical DNA are evidence of parentage by first-degree relatives. The percentage drops to 12.5 percent for uncle-niece relationships and less than 1 percent for first cousins.
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