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These Work Focussed Interviews are a mandatory requirement for Income Support claimants, usually every three years, however, they cannot require your son to seek work.
I assume your son lives with you, if both of you
- have a PIP Daily Living award, or DLA Medium Care or higher
- and no one else lives with you
then he may be eligible for the Severe Disability Premium to be added to his IS, another £65+ a week.
If you think he is then he should contact the Income Support Helpline, there is a short form to complete, which can be done over the phone, about his living arrangements. Payments should be backdated to when his PIP award was made.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
