T.H.
Keep doing what you're doing- they'll get it. My two older boys are in college now and they called to ask "what are we doing for Christmas" and I knew just what they meant!! They want to know who we are doing something for this year. My kids were brought up with a sense of giving. I was a single Mom of three for a lot of years and there were years when all I could afford for my own kids was a book, but we always gave. They have learned to be good citizens and giving people in a world where it sometimes seems ME,ME,ME. Good for you in raising them with a sense of responsibility toward others :)
Peace and Merry Christmas, T.