Children Probability

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.




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So was I.
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I agree with Joseph that David was in the bathroom and Peter was in the 2nd bedroom.
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Mandy was in the kitchen with Christopher.
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I still say Peter was in the 2nd bedroom and Jennifer was in the bathroom.
Joseph was in the 1st bedroom.

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Peter was in the bathroom with Christopher.
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