What are the odds that a brother and a sister would bowl a 300 game on the same night in the same house?

This actually happened a couple of nights ago in Lima, Ohio. Both were bowling in league competition and both were bowling as substitutes as opposed to being regular members of their respective teams. Amazing!

Quantum Raven 15lbs.
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End Date: Thursday Apr-24-2014 7:49:33 PDT
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