It is most likely that Assad and Juana believe that "nurture" is the major contributor to their child's development.
The nature versus nurture dispute includes whether human conduct is controlled by the surrounding, either pre-birth or amid a man's life, or by a man's genes. The view that people procure all or all their conduct attributes from "nurture" was named tabula rasa meaning blank or clear slate, by John Locke in 1690.