The binding legal principles established by the majority are: (1) In applications to vary custody orders to permit emigration with children, the applicant bears the onus of proving on a balance of probabilities that variation is justified, but the inquiry is essentially a judicial investigation into the children's best interests in which the court is not bound by the parties' contentions and may call evidence mero motu. (2) Section 28(2) of the Constitution makes a child's best interests paramount in every matter concerning the child, including emigration applications. (3) Where a custodian parent makes a bona fide and reasonable decision to emigrate that is motivated by the children's best interests (rather than purely personal reasons), courts should be reluctant to interfere with that decision - not because of the custodian's parental rights, but because such interference may create frustration and bitterness that could harm the children. (4) The status quo (even if currently satisfactory) is not determinative; courts must consider the children's immediate, medium and long-term interests, including whether current arrangements are sustainable. (5) Courts may consider the quality of life available in different countries (including factors such as crime rates, healthcare, education, and economic prospects) in assessing best interests. (6) Risk of psychological harm to children must be carefully weighed against proven benefits of emigration, with proper evaluation of expert evidence. (7) Expert witnesses in custody matters must be objective and neutral; evidence from biased experts is of diminished value. (8) Appellate courts should be slow to interfere with trial judges' findings in custody matters, particularly regarding credibility and assessment of witnesses' demeanor, personality, and good faith, unless clear misdirection is shown.