Final answer:
In both stories, the main problem is solved by characters returning a favor done by the princess.
Step-by-step explanation:
In both stories, the main problem is solved by characters returning a favor done by the princess. For example, in the Three Aunties, the princess saves three frogs who later help her solve problems. In Princess Frog, the frog helps the princess find her way back home after she helps him become a prince again.