Repetition in "Edward: More than just a stutter

"And what will ye leave to your own mother dear,
Edward, Edward,
And what will ye leave to your own mother dear?
My dear son, now tell me, O."
When first reading the poem I was very annoyed by all the repetition in the lines. I kept thinking to myself, "I heard you the first time!" But then as I started to imagine the scene in my head, the repetition in the dialogue began to build suspense. You could almost hear their voices begin to rise in question. These help build up to the two major climaxes. The first is when Edward admits to killing his father. The second is when he says he will leave "the curse of hell" to his mother when he leaves. The shock that comes from those lines is greatly heightened by the repetition of the questions. Also the repetition of the responses adds a stronger emotional feel to the lines, because it really emphasizes the sentiment he's expressing.