I mean I know that it would have had to have been through any children she might have had and their children had children, etc. Or, if Himiko had siblings but I kind of feel like if she was so ruthless she may have killed her siblings so they wouldn't stop her in her obsession for power, etc.

I've just always sort of wondered how Sam can be Himiko's ancestor. I know it doesn't outright say the answer and I guess it can be anyone's guess but I was just wondering what everyone's thoughts are.