The mother, driven by her extreme desire for fair-skinned children, cursed her children to have white skin that would easily burn and freckle in the sun. While she got her wish, she inadvertently cursed them to a life of hardship in the tropical climate.
The story typically ends with an explanation that this is how some people in the region ended up with fairer complexions and a sensitivity to the sun, serving as a cautionary tale about:
* Contentment: Being happy with what you have.
* The dangers of excessive desire: Wanting something too much can lead to negative consequences.
* Appreciating natural beauty: The story subtly encourages appreciating the beauty of darker skin tones and the ability to withstand the sun's rays.
In essence, the ending explains the origin of fair skin as a consequence of a mother's vanity and serves as a lesson to value what you have and to not be consumed by unrealistic desires.