Has the child been taken to another country without the consent of the other parent with custody? Or are they being held there without permission? Then the convention stipulates the following:
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The child has been in the other country for less than 1 year
Then the convention stipulates that the child will have to return to the country from which they came. There are a few exceptions to this main rule. For example, if there is a high risk of danger to the child on return.
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The child has been in the other country for more than 1 year
Then the convention stipulates that the child will have to return, unless it is shown that the child is settled in (strongly attached to) the new environment. There are also a few exceptions to this main rule.
In a return procedure, a parent can ask the court to decide that the child should be returned. For this, the court looks at the rules in the convention and then decides - based on the facts and circumstances - whether or not the child should be returned.