Jesus blood line: God-Jesus. (please not the period at the end of the blood line.
This is true. However unless I missed it the article isn't talking about Jesus's children, it is talking about siblings he would be related to either through his mother (half-brothers and sisters) or cousins also through his mother's bloodline and heritage.
The God-Jesus bloodline of course ends at Jesus as he had no children, however the Joseph-Mary bloodline probably continued on.
As stated before though by Arthur McGowan, "It’s kind of interesting, but of absolutely NO theological significance whatsoever."
Which is why I'm a strong advocate of cloning Jesus.