Little Johnny

Joke time it's the weekend.

Little Johnny was assigned a paper on childbirth and asked his mother, "How was I born?"
"The stork brought you to us."
"Oh," said Little Johnny.
"Well, how did you and daddy get born?" he asked.
"Oh, the stork brought us too."
"So. . . how were grandpa and grandma born?"
"Well, darling, the stork brought them too," said the mother.
The next day Little Johnny handed in his paper to the teacher. It read, "This report is impossible to write due to the fact that there hasn't been a natural childbirth in my family for three generations."