Who is Sammy the Snake's mother?

In the short story "Nate the Snake" (http://ift.tt/1nzGhEI), we are introduced to a snake named Nate who appears to be magical and one-of-a-kind (I won't give away any spoilers). Then, about 3/4 of the way through the story, Nate introduces his son Sammy without any explanation of where he came from.

I'm wondering where Sammy actually came from. Was he born a natural birth? If so, is his mother a regular snake or magical like Nate? Or, was Sammy magically created by Nate?