Quadroon n. : The offspring of a mulatto and a white person; a person quarter-blooded.

Example:
How hard would it be to write a story about a young Louisiana Quadroon? Whats your opinion?

Taxonomy
quadroon, octoroon, ancestry, mulatto, proportion, quintroon, African ancestry, grandparents, great-grandparents, free encyclopedia, mixed-race, one-eighth, Latin, one-quarter, century southern, ancestors, black and white, hexadecaroon.

Defination from the web:
Quadroon, octoroon and, more rarely, quintroon were historically racial categories of hypodescent used to describe proportion of African ancestry ... In Little Women by Louisa May Alcott, one of Jo's boys at Plumfield is described as a merry little quadroon. ...