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    the question should change to really address conditional probability. The sex of one child is not affecting the sex of the other, so, in whatever scenario, conditional probability doesn´t appear.

    One scenario that I would like to talk about (even if it is still not related to conditional probability) is if the probability would change if the question would be about the sex of the SECOND child, being that the sex of the first child is boy. In this case, the sample would only contain two states, thus the probability asked would be 1/2, instead of 1/3, right? The thing is that this really resontes with me about prior knowledge (the context in which bayes theorem makes sense) so, i am confused