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."
This is VERY different than what was claimed by conspiracy theorists and The di Vinci Code, both of which claimed that Jesus fathered children through Mary Magdalene. Problem is, there is no proof from Roman historians of that ever happening, nor does the Bible and several rejected books that didn't make it into the final Bible we know today.
What I meant was, not that it is of no interest, but that there would be no theological reason for these people to be “half-divine” or some such thing, as some sensationalists have speculated. Catholics, of course, will not expect to find any descendants of Mary, since we believe that she had no child other than Jesus.