Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first.
Are you actually facing prosecution?
Was it issued against both parents
Is there a Court Order confirming that your son lives with his father?
When will your son turn 16
There is no action you can take that will remove your Parental Responsibility for your son I am afraid
You could apply for a Consent order confirming that the chid live's with your ex - but that will expire on your son's 16th birthday and accordingly may not be worth the expense involved (mediator's fees plus the £215 court fee)
If you do wish to go this far then you will need to start with Family Mediation.
Please ask if you need further details
You are most welcome I hope all goes well