One has to have worked quite a bit to get unemployment benefit. Cannot remember how many weeks, but quite some time.
As NH says, parents used to have to support their kids until they were 25 and it has been known for kids to sue their parents for support.
And as NH said, it works both ways....... and as he said, one has to generalise about this!
Kids who are thrown out and have no income and cannot sue poor parents do have some sort of 'recours' now and can get help. And about time too, lots used to beg... it was awful.
So no, nothing for your son, you will be expected to keep him.
edit, posted before I meant to. Maybe voluntary work???? if he wants to be occupied?????