Drac, been here a very long time.
Graham,
“What you want to know is whether “she has a girl and a boy?”.
Nope – that’s not what the question asked.”
No, indeed but that’s why probability is only probability, if you ask a different but relevant question to get the information you need you may get a different probability, i.e. as pointed out before the odds that the remaining child is a boy are 50:50 by simply asking that question the probability of her having a girl and a boy are 50:50.
Andy.