A leave application for sister marriage is a formal letter written when you need leave to attend or help with your sister’s wedding. A clear and polite application helps the school or office understand the reason and grant leave.
Below are simple sample formats you can edit and use.

Sample 1: School Leave for Sister’s Marriage
To,
The Principal
[School Name]
Date: [Write Date]
Subject: Leave application for sister’s marriage
Respected Sir/Madam,
My sister’s marriage is fixed on [date]. I need leave from [start date] to [end date] to attend the ceremony and help with arrangements. Kindly grant me leave for these days.
I shall be very thankful to you.
Yours obediently,
[Your Name]
Class: [Class]
Roll No: [Number]
Sample 2: Five Days Leave
To,
The Principal / Manager
[School / Company Name]
Date: [Write Date]
Subject: Request for leave for sister’s marriage
Respected Sir/Madam,
My sister’s wedding is planned from [start date] to [end date]. I need five days leave to attend and manage necessary arrangements. Kindly approve my leave request.
Thanking you,
Yours obediently,
[Your Name]
Sample 3: One Week Leave
To,
The Principal
[School Name]
Date: [Write Date]
Subject: Leave application for sister’s marriage
Respected Sir/Madam,
My elder sister’s wedding ceremony is going to be held next week. I need one week leave from [start date] to [end date]. Kindly grant me leave for this important family event.
Yours faithfully,
[Your Name]
Class: [Class]
Sample 4: Simple Leave Request
To,
The Class Teacher / Principal
[School Name]
Date: [Write Date]
Subject: Application for leave due to sister’s marriage
Respected Sir/Madam,
My sister’s marriage is on [date]. Kindly grant me leave from [start date] to [end date] so that I can attend the function.
I shall remain thankful to you.
Yours obediently,
[Your Name]
These samples for a leave application for sister marriage can be customized with the wedding dates before submitting.