“…is not bound to order the return of the child if the person, institution, or other body which opposes its return establishes that there is a grave risk that his or her return would expose the child to physical or psychological harm or otherwise place the child in an intolerable situation.”
“In some situations, the taking parent unequivocally asserts that they will not go back to the State of the habitual residence, and that the child's separation from the taking parent, if returned, is inevitable. In such cases, even though the taking parent's return with the child would in most cases protect the child from the grave risk, any efforts to introduce measures of protection or arrangements to facilitate the return of the parent may prove to be ineffectual since the court cannot, in general, force the parent to go back. It needs to be emphasised that, as a rule, the parent should not - through the wrongful removal or retention of the child - be allowed to create a situation that is potentially harmful to the child, and then rely on it to establish the existence of a grave risk to the child.”
“36. Drawing matters together, Article 13(b) requires the parent opposing a child’s return to establish that there is a grave risk that return would expose the child to physical or psychological harm or otherwise place the child in an intolerable situation. Where that parent asserts that they will not accompany the child to return, the court will scrutinise the assertion closely, because it is an unusual one for a main carer of a young child to make. The court will therefore make a reasoned assessment of the degree of likelihood of the parent not returning. Relevant considerations will no doubt include the overall circumstances, the family history, any professional advice about the parent's health, the reasons given for not returning, the possibility that the refusal is tactical, and the chance of the position changing after an order is made. The Court will then factor its conclusion on this issue into its overall assessment of the refusing parent’s claim to have satisfied Article 13(b). By this means it will seek to ensure that the operation of the Convention is neither neutralized by tactical maneuvering nor insufficiently responsive to genuine vulnerability. ... 38. ... but in assessing the likelihood of a parent not returning the court is not addressing a binary issue of fact (such as consent: see Re W at [58]). Instead, it is asking whether, factoring its assessment on this issue into the evidence as a whole, that parent has established an Article 13(b) grave risk to the child if a return order is made. In that context, the court is assessing likelihood on a summary basis, not finding facts.”
“the objective of the Convention is to ensure that a child who has been removed unilaterally from the country of his or her habitual residence, in breach of rights of custody, is returned forthwith in order that the courts in that country can decide his or her long term future and that a decision by the English court to return a child under the terms of a Convention is no more and no less a decision to return the child for a specific purpose for a limited period of time pending the court of his or her habitual residence deciding the long-term position.”