Hamlet Act 1 scenes 3-5

In this reading, scene 3 opens with Ophelia's brother and father giving her advice about her relationship with Hamlet. They warn her that Hamlet will break her heart because his royalty does not allow him to choose his own wife. They also warn her that Hamlet is immature and his love for her does not run deeper than youthful lust. I am surprised that Ophelia's family does not want her to be connected with the royal family, but perhaps this shows that Polonius cares more about Ophelia's well-being than family connections. However, I think Polonius and Laertes are being a bit dramatic and describing the stereotype of young men rather than Hamlet's actual character. How well do they really know Hamlet? I am also curious to know the history of Ophelia's relationship with Hamlet.

Scene 4 is when the ghost appears. When Hamlet is preparing to follow the ghost and his friends are trying to convince him not to, Horatio warns that the ghost might draw him into madness or "to the dreadful summit of the cliff." This is foreshadowing to the chaos that ensues for the rest of the story. He will become so focused on his goal of avenging Hamlet that he goes a little mad, suicidal, and often puts revenge before reason.

Scene 5 is when the ghost informs Hamlet that he must take revenge on Claudius. During this scene, I am confused about how Hamlet treats the ghost. If the ghost is his father, why is Hamlet calling him "ghost" instead of "dad?" There seems to be a much more distant relationship between the ghost and Hamlet than I would expect. Is the ghost somehow different than the actual mind of his father? Because if I saw my father as a ghost after he died, I would be so happy and much more personal and friendly with the ghost. I am curious to see if Hamlet has more conversations with the ghost and if there is going to be a ghost character arc.