Yes a sad story, if it is true. But thats the problem, there are so many scam artists out there, unless you knew this man personally you couldn't tell if he is telling the truth or not.
If he is in the situation he says he is in I would advise him to go to Citizens Advice about his debt problems. Also if he is not working as he says, he will still be getting child benefit and housing benefit etc.
So although he may not have any expendable income, by the sound of it he still has a roof over his head and some food on the table.
I reckon its a scam anyway.