Well, for starters, if it's an incurable disease doing a "get well" letter is a bit sardonic. Try not to focus on the disease at all, emphasise how you're willing to be there for them during this diffucult time and so on.
Dear -----------------------------,I am so sorry you got so sick. I miss you so much.I hope you recover soon.I never want you to leave again. Love, ----------------------------------.
(1) Dear Aunt Bea, (2) I was so very sorry to hear that your pet parakeet Petie had passed away. (3) I know you loved him and no one ever took better care of a bird than you! (4) I will never forget...
trying to write a letter about yourself basically means you are describing yourself (that is your character, behavior, mood...) But of course it also depends on who you are writing to. If you are...
You can write letters to friends and/or family members. Some people think that snail mail is dull and boring, but I feel anxious and excited to see what reply I get. =)