Is there a better way to tell grandpa about my aunt's passing?

My grandpa is on a trip at this moment and will return on August 16th. My aunt (his 3rd child among 4 brothers... the only daughter) passed away last week from a sudden heart attack.

They used to have a unique, different bonding than him with the sons. He was very strict and tough with all the boys but a soft parent with her. My grandma (his wife) already passed away last year. And now his only girl (my dad's sister) died? How to tell him that when he comes back? Any better ways?

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4 mo
The news will destroy him. He grew up with only brothers and mainly male cousins. Now his only daughter is gone.
Is there a better way to tell grandpa about my aunt's passing?
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