The undated photo shows the black and white twins that have been born to a mixed-race couple in Germany. [Photo: Agencies]

Even if they dress alike, it won't be difficult to see the difference between twin sons born July 11 to a German couple.

The first baby, Ryan, has light skin and blue eyes. His brother, Leo, is dark skinned with brown eyes.

"None of us could believe it," the maternity ward's head doctor, Birgit Weber, told one news source, "Both kids have definitely the same father."

Stephan Gerth is German and white. His wife, Florence Addo-Gerth, is from Ghana and has dark skin.

"It was a real surprise," Gerth told the German newspaper Die Welt, adding the most important thing to him isn't color, but that everyone is healthy.

The odds are one in a million, say doctors, but can happen with fraternal twins due the genetic soup in our backgrounds.