Drinking wine after the burial of a family member?

Dear Rabbi
Is there a law concerning drinking wine after the burial of a family member? I have seen this done and wonder whether there is a source for it?
Ronnie
 
Dear Ronnie,
There is a custom to give mourners some wine after the burial. The source is the verse in Proverbs (31, 6), Give liquor to one who is lost, and wine to those who are bitter in heart. Of course we yearn to never have to fulfil this verse.