urgent relationship issue between brothers

Complicated but need prayer asap for my 2 sons and family and relationships. Christian Orthodox elder son agreed to be Best Man and children involved in younger son ( non Christian). This was recent and I thought an answer to prayer. Now eldest Christian Orthodox son is probing to find out what kind of wedding it is. He texted younger son. This offended younger son and younger son is geared up and says he will be really upset if his older brother is trying to persuade him to change it to being a pastor . He somehow thought it might be a wedding of another religion. It is obvious to me that someone near to me sees my prayer requests on another site. That is where I included that they are showing love and shining the light of Jesus no matter what religious beliefs or political beliefs there are. Younger son refuses to call him to find out more. I am torn up inside. Please pray that this resolves quickly and happily. I cannot stand to have another family hurt. We lost our grandchild eldest brothers child in Oct. I thought the brothers were starting to get along since the funeral especially. Our younger son and fiance drove 800 miles one way to be here for all of us. If elder son says the wrong thing it could drive younger son and fiance away from Jesus when all that is needed is LOVE and acceptance where they each are. I am really stressed about this. It may not be what eldest son wants for his brother’s wedding but it will be a Civil Ceremony. The officiant will be a bridesmaid and she’s gay which also has me concerned about the relationships issue. At first eldest brother and family were so excited about the wedding and now these questions. Praying for salvation and a revelation of Jesus Christ of Nazareth for my younger son and fiance and also peace and joy in my family. This has the potential to really make everything very difficult and sad in our family.