Today's Christmas Traditions come from Germany. Germany has a VERY long association with Christmas and many of the traditions that we, within the UK have claimed as our own, actually started in Germany. They also don't believe that Father Christmas delivers your gifts! You can find out more here , here and here.
Key Vocabulary (you can pop here to Google Translate and they can say them for you) :
Frohe Weihnachten - Merry Christmas
Weihnachtsmann - Father Christmas
Weihnachtsmittagessen- Christmas Lunch
Weihnachtsstrumpf - Stocking