jefm you are being treated horribly IMHO by this son.
How could he hand over presents for others and not for you?
Has he always done this, or just the last year?
I would not be buying a present for him in future, but of course, yes for the DGC.
Time for all Grandparents and Parents to make a stand about being treated as doormats!
Online clothes company that keeps changing its name
and 
if you don't drink wine