Class assignment leads 8-year-old to become bestselling author

"He won't always listen," Nia told CBS News.

Nia Mya wrote a book about her experiences as a big sister titled, "How to Deal With and Care For Your Annoying Little Brother." The book has since landed at the top of Amazon's Best Seller list for parenting under the sibling relationships subsection.

The book began as a first-grade class assignment last year.

“Nia Mya shared that she was a great big sister to an annoying little brother,” teacher Beth Hankins told CBS News.

Nia Mya’s mom, Cherinita, turned the book into a summer assignment, encouraging Nia Mya to work on getting the words and sentences just right.

Now, Nia Mya has a fan base and attends book signing for her book. She said she learned something very valuable from the whole experience.

“I learned to follow my own dreams,” she said.