Maybe I don't understand it? I'm under the impression that a sister,half-sister,or even a cousin would have DNA similiar enough to the mother to "pass". After all,they are not lookuing for a exact match to the child because they have no DNA record for her. They would only be looking for a relative to the mother. Am I wrong? These Travelers don't seem to be big believers in birth control or small families,so there should be somebody around who could "pass" if I'm right.
It looks like you do understand it. If she tried to pass off an unrelated girl who looks like the one in Kohl's videotape, DNA testing would catch it. If, as you suggested, she tried passing off a sister's kid or something like that, perhaps it wouldn't.
I'm pinging a few FReepers who (unlike me) have some real knowledge of genetics.
-- dighton, caught way the hell out of his depth.