“I conclude that the modern concept of a child’s habitual residence operates in such a way as to make it highly unlikely, albeit conceivable, that a child will be in the limbo in which the courts below have placed B. The concept operates in the expectation that, when a child gains a new habitual residence, he loses his old one. Simple analogies are best: consider a seesaw. As probably quite quickly he puts down those first roots which represent the requisite degree of integration in the environment of the new state, up will probably come the child’s roots in that of the old state to the point at which he achieves the requisite de-integration (or better disengagement) from it.”
“the identification of a child’s habitual residence is overarchingly the a question of fact. In making the following three suggestions about the point at which habitual residence might be lost and gained, I offer not sub- rules, but expectations which the fact-finder may well find to be unfulfilled in the case before him: (a) the deeper the child’s integration in the old state, probably the less fast his achievement of the requisite degree of integration in the new state; (b) the greater the amount of adult pre-planning of the move, including pre-arrangements for the child’s day-to-day life in the new state, probably the faster his achievement of that requisite degree; and (c) were all the central members of the child’s life in the old state to have moved with him, probably the faster his achievement of it and conversely were any of them to have remained behind and thus to represent for him a continuing link with the old state, probably the less fast his achievement of it.”