“There is no objectively certain answer on which of two or more possible courses is in the best interests of a child. In all save the most straightforward cases, there are competing factors, some pointing one way and some another. There is no means of demonstrating that one answer is clearly right and another clearly wrong. There are too many uncertainties involved in what, after all, is an attempt to peer into the future and assess the advantages and disadvantages which this or that course will or may have for the child… …cases relating to the welfare of children tend to be towards the edge of the spectrum where an appellate court is particularly reluctant to interfere with the judge's decision.”
“Thus an error in the balancing exercise justifies intervention only if it gives rise to a conclusion that the judge’s determination was outside the generous ambit of reasonable disagreement or wrong within the meaning of the various expressions to which he had referred.”
“Appellate courts have been repeatedly warned, by recent cases at the highest level, not to interfere with findings of fact by trial judges, unless compelled to do so. This applies not only to findings of primary fact, but also to the evaluation of those facts and to inferences to be drawn from them…The reasons for this approach are many. They include: i) The expertise of a trial judge is in determining what facts are relevant to the legal issues to be decided, and what those facts are if they are disputed. ii) The trial is not a dress rehearsal. It is the first and last night of the show. iii) Duplication of the trial judge's role on appeal is a disproportionate use of the limited resources of an appellate court, and will seldom lead to a different outcome in an individual case. iv) In making his decisions the trial judge will have regard to the whole of the sea of evidence presented to him, whereas an appellate court will only be island hopping. v) The atmosphere of the courtroom cannot, in any event, be recreated by reference to documents (including transcripts of evidence). vi) Thus even if it were possible to duplicate the role of the trial judge, it cannot in practice be done.” i) The expertise of a trial judge is in determining what facts are relevant to the legal issues to be decided, and what those facts are if they are disputed. ii) The trial is not a dress rehearsal. It is the first and last night of the show. iii) Duplication of the trial judge's role on appeal is a disproportionate use of the limited resources of an appellate court, and will seldom lead to a different outcome in an individual case. iv) In making his decisions the trial judge will have regard to the whole of the sea of evidence presented to him, whereas an appellate court will only be island hopping. v) The atmosphere of the courtroom cannot, in any event, be recreated by reference to documents (including transcripts of evidence). vi) Thus even if it were possible to duplicate the role of the trial judge, it cannot in practice be done.”