Write an application To the Principal for leave on account of Brother's Marriage

Sir,

The marriage of my elder brother is going to take place on the 12th instant. Since I am the only male member, except my brother and father in the family, my presence in the house to extend a helping hand for taking care of all sorts of preparations is absolutely necessary. Moreover, my father wants me to help him in looking after the guests as well.

Please grant me leave for a week with effect from the instant and oblige.

I shall be highly thankful to you.

Yours faithfully,