So it turns out Contador is Frank Schleck's sibling. I wonder what Contador's arch-rival Andy Schleck makes of that...
Proof, if proof were needed, that Wikipedia isn't always accurate! Made me chuckle.
The content on google is not directly scraped from wikipedia - in fact, neither the wikipedia entry for Frank Schleck or Contador say they are brothers - however, in one section of the Frank Schleck article, it does say his brother […] and Alberto Contador - except it is actually talking about Andy Schleck when it says brother, not contador as his brother - the sentence has the subject/object slightly muddled, but it's not completely poor English, and a real person reading it wouldn't assume they were brothers - however, if you are a computer algorithm working for google (which is the culprit here, *not* wikipedia) then you can't tell the difference.
Wikipedia has it's problems, but this kind of accuracy issue isn't one of them.