You can response like this. It gives me immense pleasure to cordially Invite you and your family on the auspicious occasion of my brother's marriage.This browser does not support inline PDFs. Please download the PDF to view it: Download PDF. Write a Letter to Your Friend Inviting Him to Attend Your Brother's Marriage. Invite your relatives to your brother's wedding with these heartfelt messages. You are warmly invited to celebrate my brother's wedding with us. How to write a letter inviting my brother who lives in Haiti to attend my wedding in the US? Discover 15 phrases to politely turn down an invite without offending the person, according to etiquette experts. It's My pleasure to invite you to the wedding ceremony of My Younger brother, Mr. Robin on May 12,2013.