I think it is a lovely idea to reach out to them in writing. Maybe a notecard with a few sentences saying you are looking forward to meeting and getting to know them. You could include a photo of you and their grandfather (or you and a pet, if you have one -- kids like animals) so they can put a face to the name. If grandpa is a FaceTimer or Zoomer, you could join him in a call at some point, as well.
Good luck.
kathy
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