Silversam
As he has an award of ESA he cannot be asked to work or to seek work.
If he is in receipt of Carers Allowance then he should be excused from any Work Related Activity, but this does not include Work Focussed Interviews which he must attend.
His JC+ advisor will no virtually nothing about his circumstances, so he will need to make them aware of his CA claim and his health problems.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems