Certainly! Here’s a guide on how to write an application for your sister's marriage request.

Introduction
The application should be respectful and clearly articulate your request for your sister's marriage. It is essential to address the appropriate authority, providing all necessary details.

Format of the Application
- Sender's Information:
- Name
- Address
- Contact Number
- Date
- Receiver's Information:
- Name of the Authority/Recipient
- Designation
- Address
- Subject Line:
- Application for Sister's Marriage

Body of the Application
- Salutation:
- "Respected [Recipient's Name],"
- Introduction:
- Briefly introduce yourself and state your relationship to the applicant.
- Purpose of the Application:
- Clearly mention that you are seeking permission or blessings for your sister’s marriage.
- Details of the Marriage:
- Mention the prospective groom's name, family background, and why you believe this is a suitable match.
- Conclusion:
- Request for blessings or permission and express gratitude for considering your application.
- Closing:
- "Yours sincerely,"
- Your Name

Example of Application
[Your Name]
[Your Address]
[Your Contact Number]
[Date]
[Recipient's Name]
[Recipient's Designation]
[Recipient's Address]
Subject: Application for Sister's Marriage
Respected [Recipient's Name],
I am [Your Name], the brother of [Sister's Name]. I am writing to seek your blessings for my sister's marriage with [Groom's Name], who hails from a respectable family.
We believe this union will bring happiness and prosperity to both families. We would appreciate your support and blessings for this occasion.
Thank you for your consideration.
Yours sincerely,
[Your Name]
Ensure to proofread the application for clarity and correctness before submission.