Final answer:
The lesson in folktales stressing gratitude towards parents is that one should show unwavering gratitude and respect for their parents, aligning with values like Confucian filial piety.
Step-by-step explanation:
In the folktale that teaches the importance of gratitude towards parents, the lesson regarding denying one's parents is that one should never deny his/her parents and should always show gratitude towards them. Unlike some interpretations that may focus on independence or respect, traditional tales often emphasize family cohesion and reciprocation of care and respect, as seen in Confucian values of filial piety. Filial piety teaches respectfulness and devotion to one's parents, suggesting that the wellbeing of family relationships is paramount over asserting independence or personal desires. Indeed, these stories and cultural teachings reinforce the idea that acknowledgement and respect for the sacrifices and guidance of parents is a fundamental moral principle.