Any fun ideas to tell older kids?

Sam • Homeschooling mom to 7 children
We decided awhile ago to tell the kids on Mother's Day but now that it's getting closer, I don't know what to do, or if we should just blurt it out. 
Every Mother's Day, we go to a rose garden/park and have a picnic and spend the day outside. We always have a blueberry catching contest too. lol 
My older kids are 20, 13, 12, 10, and 5. They all want a sibling and I know they'll be so excited, with the exception of my ten year old, he'll have to warm up to the idea, I think. 

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