Here we have an excellent informal letter congratulating friend on sister’s wedding.

Examination Hall
City A.B.C
February 28, 2025
Dear Friend,
Your letter brought the exhilarating and heartwarming news of your sister’s wedding. Sisters are truly among the most precious blessings in life, and such a joyous occasion fills the entire household with happiness and excitement. I am sure all your family members, relatives, and well-wishers must be eagerly awaiting this special day. Please accept my heartiest congratulations on this delightful event. My entire family is equally pleased to hear the wonderful news, and I convey their sincere, heartfelt wishes to you and your loved ones.
Here we have an excellent informal letter on Congratulating friend on sister’s wedding.
Mr Ahmed Hassan appears to be a perfect match for your sister. He is humble, polite, and courteous—qualities that form the foundation of a happy and successful married life. May Allah Almighty bless the couple with everlasting happiness, mutual respect, and understanding, and keep them always in His divine protection.
“The secret of a happy marriage is finding the right person.”
— Julia Child
It is my earnest desire to be present at the wedding ceremony and share this memorable moment of joy with you all. Moreover, I wished to arrive a few days earlier to assist you in the preparations and enjoy the festivities. However, due to my Mid-Term Examinations, I regret that I shall not be able to attend. Nevertheless, I sincerely hope you will understand my situation and excuse my absence. Though I may miss the celebrations in person, my prayers and good wishes will surely accompany you on this auspicious occasion.
Meanwhile, I am sending a small present for your sister as a token of my love and affection. I hope she will like it. God willing, I shall visit you soon after my exams and celebrate properly then.
Once again, I wish your sister a truly prosperous and blissful married life. May her marriage grow stronger with every passing year and remain filled with love, harmony, and patience.
“When a marriage works, nothing on earth can take its place.”
— Helen Douglas
Kindly convey my warm congratulations and compliments to all the members of your family.
With best wishes,
Yours sincerely,
X. Y. Z
Hope you liked this informal letter congratulating a friend on sister’s wedding.