Nonsense.
LOL, absolute nonsense.
Do you mean not related at all, or just not closely related? I know Neanderthals are a different species than Homo Sapiens, but wouldn't there be some similarity in the DNA? After all, I can't think that Neanderthal DNA would be closer to a dog's or a cat's or a mammoth's than to a modern human's. But then, I was a literature major. What do I know?