This is more than that: it wasnt his dna, it was one of his relatives dna on the site that got him found.
Im guessing that any relative has a right to divulge his dna and rat out a blood relative in a situation like this, but I doubt people actually consent to that use when they are looking at a genealogy site.
Im guessing that any relative has a right to divulge his dna and rat out a blood relative in a situation like this, but I doubt people actually consent to that use when they are looking at a genealogy site.