Thank you for your question
My name is ***** ***** I shall do my best to help you.
I am sorry but this is not something that you will be able to do.
If you do try and remain in Scotland then your ex will be able to make an immediate and urgent application to the Court using the Hague Convention to ensure that she is able to return with them to Australia.
You will potentially face prison if you do not hand over the passports - which cannot be blocked in any way
This will be done swiftly and the matter will be resolved as it is the Australian Family Courts which have the power to determine where the children live and with whom.
I am sorry - I appreciate that this is not what you wish to hear, but you would do better to organise some form of "intervention" by her family to help her address her issues
Please ask if you need further details