Copycat, copycat

"Mom, can we do a craft?"
"Mom, can we do a craft?"

"Mom, where are the crayons?"
"Mom, where are the crayons?"

"Caleb! STOP copying me!"
"Caleb, stop copying me"

"Moooom, Calebs copying me"
"Moooom, Calebs copying me"

"Caleb, stop copying your sister"
"Caleb, stop copying your sister"

What is it that is deeply rooted in every single childhood with every singly sibling and there innate need to copy???!!!! Where do they learn it? HOW do they learn it? I really want to know, cause I want to find these "copy teachers" and shove thier head into the ground......

We have entered into the stage of copying in our house......