Never we seen anything like them, such extraordinary athletes sharing the same blood. Is there any rational case against the Williams sisters, Venus and Serena, being crowned the greatest sports siblings ever? Well, no. Not when they are generally regarded as the best players in women's tennis. Not when they have between them 18 Grand Slam singles championships.
The juiciest debate is that over which sister is superior. We say Serena, but we reserve the right to change our mind.
No siblings have ever been able claim spots 1A and 1B atop a sport. And with these two, it's interchangeable.