Answer:
[Your Name]
[Your Address]
[City, State, Zip Code]
[Date]
Dear Mom and Dad,
I hope this letter finds you both well and enjoying your vacation. I wanted to update you on the situation at home since you left.
As you know, you left me and my elder sister, [Sister's Name], behind while you went on vacation. However, there is a small problem. [Sister's Name] has not been sleeping at home since you left. She is spending her nights at her friend's place, and I have been staying alone at home.
While I appreciate the trust and responsibility you've given me, it's becoming quite overwhelming to be alone in the house, especially with [Sister's Name] not being around. I feel anxious and uncomfortable, and I miss having her here with me.
I understand that everyone deserves to have some fun and independence, but I would feel much better and safer if you both could return home as soon as possible. Having you here would provide me with the comfort and support I need during this time.
I promise to take care of everything in your absence, but I really hope you consider cutting short your vacation and coming back home. It would mean the world to me, and I'm sure [Sister's Name] would appreciate it too.
Please let me know if it's possible for you to return earlier than planned. I eagerly await your response and hope to see you both back home soon.
Take care and have a safe journey back.
With love and concern,
[Your Name]