Being a cancer patient myself, I understand how both might experience what they did. She was angry with him because he reminded her that she may not see graduation let alone marriage.
He lacked a lot of understanding in the beginning until she tamed him. He couldn't possibly understand, even at 18, what her problem was. Was it God? Was it what was left unfinished? Was it how he cleverly manipulated her deepest wishes -- like being in two places at once. Slowly she began to see that he was adapting to a philosophy of "Not me but thee." Like marriage. She looked the part of an emaciated cancer patient especially in the hospital.
The scene that is particularly heartbreaking for me was the scene between Landon and his father. I am a parent and I know how it feels to be dressed down by your kid especially when that kid is right. The father must have felt Landon's helplessness. So he did something about it. It is not unrealistic; it is just what fathers do.
It is a not to miss movie or book. Any well stocked library has a copy of one or the other or both.
How are you wish you are fine there I want to write the letter from so many days but didn't getting the time I want to say that the festival of Diwali is coming all my friends hv the set of new clothes I don't hv please buy me the new clothes on this diwali please buy a set of jeans and a shirt hope u will buy..I love u mom and father..bye