How to write a Letter to your friend inviting him to attend the marriage of your elder sister.
My Dear Friend,
I hope you to be healthy and hearty there, enjoying good day we are all well here. This is to inform you that the marriage of my elder sister has been finally settled. It will take place on 15th June. I extend my invitation to you to attend the marriage. You must not wait for the wedding day. You should reach here quite earlier. Your presence and co-operation will be of much use to me.
You know, I am the only brother of my sister. After marriage, she will be away from me. I shall not be able to bear her separation. She loves me very much. I too have much love and regard for her. Your presence will console me and sustain me from any set-back. Ask your younger sister to come along with you, if your parents allow her. She can give good company to my sister. She can also help her in arranging the petty things during marriage.
Extend this invitation to your parents also. Hoping to get a favourable reply from you soon.