In the end the audience knows the couple died put the parents do not this is an example of?

This scenario is an example of dramatic irony, where the audience possesses knowledge that the characters do not. In this case, the audience is aware of the couple's fate while the parents remain oblivious, creating a tension between what the characters believe and the reality known by the viewers. This contrast heightens emotional engagement, as viewers anticipate the moment when the truth will inevitably be revealed to the parents.