Final answer:
Pedro's perception of depth, where his son appeared closer than his daughter due to overlapping, is influenced by the visual depth cue known as interposition.
Step-by-step explanation:
Pedro's perception that his son was closer to him than his daughter because his son partially blocked his view of his daughter is most clearly influenced by a distance cue known as interposition. Interposition is a monocular cue in our visual perception that allows us to see one object as being in front of another object because it overlaps the second object. This cue, along with linear perspective and relative size, helps us perceive depth in a two-dimensional visual field, enabling us to establish a sense of three-dimensional space.