I am so sorry for the pain and loneliness you are feeling. I too stand alone my brother, and I cannot seem to convince anyone no matter how hard I try. I know what you are feeling; it is a burden that is hard to carry sometimes.
The only thing that gives me peace in my situation is that the potter knows what He is doing. Our loved ones and others who remain lost do not have the Holy Spirit to discern these spiritual things. And, no one receives the Holy Spirit unless the Lord stirs in them first. The Lord knows where they are, and He knows where they are going.
My only suggestion for you is to stand firm; stand on the truth that the Lord has so graciously given to you. Stand in gratitude and praise Him through it all. And of course, earnestly pray for those you love. Pray that the Holy Spirit would stir and they would respond. Pray that the veil would be removed and they would see the truth and the glory of God in Jesus Christ. And very importantly, let them see your light shining. THAT, my brother, is the one thing they cannot deny - Christ living in you. And if you continue with less words and more action, they just may be convinced by the Jesus they see in you. God gives that promise to wives in 1 Peter 3:1, so I am assuming it is the same for husbands in the same situation.
Thank you for sharing your heart with us. I will pray for you and your family Charles. Jesus knows your pain, and He is there to comfort you at this very moment. Also, know you are not alone!!