Hi I'm new i could use some help

Hi this is my first post on the site and could really use some help. Well in my English lessons we have started to look at Wuthering Heights and I have been told just yesterday that i must complete a presentation on the text soon.

My presentation is looking at the doubling of characters and the two characters I must look at are....

Heathcliff and Linton Heathcliff.
These are the questions I have to answer in my presentation and I have to use Quotes from the next

1) Why have these characters been included?
2) How do these characters relate to each other?
3) How these characters relate to other characters within the novel?
4) How do the two characters use language?
5) How do other characters speak about them?

I have come up with a few answers but they aren't very detailed and i am really struggling to give good analysis.
I would really appreciate any help you could give me. Thanks.

I'll try to help you although I don't see the really interesting thing about these questions, but it's not my role to make them...

1. Why have the characters been included? I'd say because the writer just thought about them, but that will obviously not be the answer. Heathcliff is one of the main characters, the plot evne revolves around him, so he was included anyway. Linton is his son. Possibly the teacher means 'why was Linton included?' He was a means of revenge of Heathcliff to procure Thrushcross Grange through only daughter Cathy Linton.
2. How do they relate to each other? They are obviously father and son, but they do not really act as father and son. The son does not act like one because foremost, to me, because he has been seperated from his father for twelve years and has never even heard of him before he (Heathcliff) actually comes for him after Isabella died. Heathcliff does not love, he uses, so why does he want his son? For revenge. He does not care in the least for him as might suggest his failure to really try to treat his disease.
3. How do they relate to other characters? Both are selfish nasty creatures. Heathcliff maybe more justified than Linton.
4. How do they use language? I would really not know a straightforward answer to that... I do have the impression that Linton uses a lot more words than Heathcliff, his words are also the opposite of what they seem (good-eveil).
5. How do other characters speak about them? That's the easiest one. Just look up in the beginning and you'll see how they speak about Heathcliff. Linton is quite a split matter between young Cathy and Nellie, I think.

One piece of advice: get yourself an e-text of Gutenberg (free download) then you can look up any word in the text over the whole of the book without havig to click on chapters all the time. Quick and easy.

I hope I helped you.

Good luck!
k