How to write a letter inviting my brother who lives in Haiti to attend my wedding in the US? To help you extend invitations, we have samples on how to write a letter to your friend to invite to your brother's wedding for you.I invite you and your entire house to attend my sibling's muchawaited wedding ceremony. All words should be spelled out on invitations, enclosure cards, and envelopes, no matter how informal your wedding is. It gives me immense pleasure to cordially Invite you and your family on the auspicious occasion of my brother's marriage. ENGLISH Q.No.7 Letter: (i)To a Friend inviting on Brother's marriage. (ii)To Sister congratulating on her success. We are delighted to invite you to my brother's wedding. Your presence would make the day complete. Must come at least 5 days before the marriage.