Answer:
Dear sister,
Step-by-step explanation:
Some unfortunate news has been brought up. Father was awfully injured and is in critical condition. We are afraid he may not make it. When mother got the news she was very scared for what was to come. She hasn't spoken much the past few days, and I'm not sure she's holding up very well. I attempted to reach out to our brother, but he hasn't responded to any of my advances. When you receive this letter could you try and contact him as well? I am very sorry you had to receive the news like this. Hope you're doing well.
-your brother