Answer:
the llorona is about a family that consisted of the mom, the dad, an the 2 sons. she found out that her husband was cheating on her so she decided to get revenge of him by hurting the people he loved most which were the sons. she drowned them both on a stream or a lake and the later regretted it and killed herself so now she hunts people and goes around saying "mis hijos" (my children)
i hope this made sense because i used google translate