Storytelling runs in the family

I was walking in the woods with my son the other day and we came across a treestump with a cave underneath. There were three tiny pinesaplings growing atop it and it looked quite magic.
"What kind of an animal would live here?" I asked my son. He shrugged and said "A fox, perhaps?"
I said, "No, I mean a make-believe animal." Suddenly there was a glint in his eyes as if he had only been waiting for a question like that. With a wide grin he informed me that a Pili lived under that treestump.
"It looks a bit like a fox, but it's smaller and yellow, not red. It has round ears and a triangular head and it can open it's mouth really wide." He showed me with his hands how wide and I laughed. "That's more than the size of the entire animal!"
"Maybe, but it's make-believe, right?" He then told me that Pilis can jump really high, as high as the highest trees and they eat birds and can catch them right out of the air or off the boughs of trees. Pilis have enemies, too. Snakes, big big snakes called Ratana. They are as long as the longest anaconda and they can stand upright. They have horny growths behind their heads that they can spread out and if they stand upright with the horns spread out they look like dead trees. The Pilis jumping in the air to catch birds might land on them and then they would be caught.
For the rest of the walk my son told me all about Pilis and Ratanas and the dimensions they usually live in and I thought: Storytelling must run in the family.