What trait of Polonius is revealed by his plans to spy on his son? What does it reveal about Laertes?

In sending Reynaldo to inquire, thus, spy on his son, Polonius exposes his deceit and mistrustful nature. Laertes, on the other hand, remains a mystery. We know he enjoys the social entertainments in France, and it is easy to infer that he'd rather be anywhere than at court with his family.