Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How old are the chidlren and are there any Court Orders in place?
Where does he wish to take the children?
Does he have any family there?
My apologies for the delay
When did he last threaten to take them form you?
When does he wish to take them on holiday?
In that case you have every right to refuse to release the passports as there is serious cause for concern.
he cannot remove the children from the country without your agreement or an Order from the Court
You can either wait for your ex to apply to the Court for an Order allowing him to take the holiday (unlikely given the odd name issue) or you can make your own applictaion to the court for a Prohibited Steps Order preventing him from removing the children from the UK.
This is done using a Form C100 and paying the fee of £100
I hope that this is of assistance - please ask if you need further details
You will have a full opportunity to explain your very valid objections - please do not worry