sibling rivalry

The Times has a great profile of the Bryan twins, one of the greatest tennis doubles pairs of all time. One of the interesting points is that when they were growing up playing singles, whenever they met each other, their dad (a former pro tennis player himself) wouldn't let them play each other. Instead, they would alternate forfeiting. That wouldn't have necessarily occurred to me, but it strikes me as the right thing to do, at least while the kids are young. The junior circuit is so competitive, that having two brothers--in this case, twins--play each other would generate a lot of ill will around the house. Better to just avoid the sibling rivalry, and focus on all the other matches.