while running with kids in the stroller

In her boredom/daydreaming Emmie started to call her brother names,"boobooThane, Pizzahead" and others. She was cracking herself up at the announcement of each name and they were getting louder.
I asked her if she would like to be called those names or something like it AKA "pee-pee Emma". She said "No, that wouldn't be a fun name."
Trying to change the topic I asked her if she knew what names we used for Thane and that sometimes we call him TD. I told her TD comes from David for Uncle Dave and Grampa David.
She said
"I miss Dave."
"I miss him too."
"How did he die mom?"
"I don't really know Em."
She said, "Maybe he got eaten by a dragon!"
"Maybe a squirrel bit him from a tree!"...
"I don't think so Emmie."
"Maybe it was a bad, one-bad squirrel!"
"Maybe it was a bee stinger!"
"Maybe he died by hiself."
"Maybe he had a bad day and was hit by a car!"
"Maybe it was a flower poker or something like that mom!.."
She was really concerned about the how, and I can't answer it.
I am sure Uncle Dave would find it funny to hear her ideas, and be happy that she remembers him. I know it helped me laugh and made me smile even if the conversation was a little strange.