I need help announcing!!

Katlyne • Single Momma of 2💜 Annabella Desire’e Lee 👶🏻👑👸🏻🌈 12.04.17, 8lbs 5.5ozs. Edward Alekzander 👶🏻👑🤴🏻♥️ 02.06.19, 8lbs 12ozs.
So I'm currently 10 weeks 4 days! My grandparents will be at my parents house TOMORROW! And I have no clue how to tell them they're going to be great grandparents! I need ideas and fast!!! I have no clue what they like, it's been almost 12 years since I've seen them!! 
I was going to tell them through the game speak out but my dad said his parents wouldn't like that. 
PLEASE HELP! I want to make this special as this is their first great grandbaby! 

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