Logic Puzzles

Yes, I agree. But, to remove the ambiguity, shouldn't the question say 'from a sample of famillies with at least one boy', in which case there are only three possible possibilities.

On the other hand, if you think that a family was chosen at random (so GG is possible) and then a question asked about that question which happened to contain at least one boy then the answer is different I think

Ardicius rephrased the question to be:

A lady has two children, of which we know at least one is a boy. What are the chances of the other child also being a boy?

"of which we know at least one is a boy" limits the possibilities to the sample of families with at least one boy.