Homosexual marriage

2 years ago our daughter told us she was in a same sex relationship. we have prayed that the Holy Spirit would convict her that this is wrong. This week she announced they are getting married next August. We are so sad that this is happening. Pray for us as we continue to put this in God's hands. We desire to keep a good relationship with our daughter but do not support this choice. To top it all off my brother, who got the necessary certification to officiate weddings for those same sex couples who can not get married in church, is officiating the wedding. Our family is being torn from all sides. Those of us who do not support this, those who are indifferent and those who support them. We need God's guidance.