Hi Mother
In the past a Passcard has not been accepted as ID by the DWP.
As you are unlikely to be able to do an online ID verification the best option is to request a Biographical Test. This can be conducted over the phone. Your son will be asked 3 questions relating to his previous Benefit claims. It would be a good idea if you were with your son at the time of the call as the questions can be confusing. If you prefer you could do this Biographical Test face to face in the Jobcentre with a Work Coach.
Let me know how you get on.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
