The storied probability question of the two-child family with at least one son was
a while ago in original form, and again lately with a few twists.
In the latter post, I suggested /page__view__findpost__p__247003 about the
information given in the puzzle, and in some cases the probability asked for might be 1/2.
In the first topic I had argued most vehemently for 1/3, although I never stated the
assumptions that are needed to support that answer.
Assumptions were also debated in