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 how far do you think that she is moving?
Have you spoken to the schools to see if the children are still attending?
When did she go (best guess will do)
This is done using a Form C100 available here
It is an urgent matter and the fee is £215.
You are asking for the Order to be made - and for the DWP/and or the police / and or Social Services to release her address TO THE COURT for service
You can also ask for a Child Arrangement Order so that Contact can be re-established
Please ask if you need further details