Lady Sidhe had the handle on easing young minds into reality.
There WAS a Santa Claus at one time. It is love in your heart.
There IS a reason for the easter bunny and the christmas tree although not Christian ones. Knowlege is power so ease them into the customs...and replace it or keep it.
Making traditions a family affair about what is kept and what is not in the teen years as I am experimenting with. One thing that never changes is that Christmas cut out cookies are powerful medicine!
