"I know why, Elmo! My mum and dad told me, it's because of melanin, right Dad?" Wes responds.
"That's right," Elijah confirms, later adding, "Melanin is something that we each have inside our bodies that makes the outside of our bodies the skin colour that it is. It also gives us our eye and our hair colour."
"The colour of our skin is an important part of who we are but we should all know that it's okay that we all look different in so very many ways," he said.
The assistant vice-president for US social impact at Sesame Workshop, Rocio Galarza told Good Morning America the video and others are a way to explain difficult concepts about race to young children.
"Young kids, since infancy, start understanding differences and giving value to those differences," she told the outlet. "The idea here is, how do we address it in an age-appropriate way?"
Wes and Elijah are just a small part of the show's ABCs of Racial Literacy programme which was created to help children and their families celebrate their "unique identities" and offer "strategies to answer sometimes tough questions around race and racism".