It's not your burden to carry. You're not the Savior and you're not the Holy Spirit. Look, if you're believing for your family member or loved one to turn to Christ, you desire a good thing, so never give up. You should continue to pray persistently for them. You should continue to lovingly preach and demonstrate Christ for them. Yes, do these things. But while you do the possible, remember that it's God's job to do the impossible. Even as you believe for a loved one's salvation, you can live in joy and peace. I know it can be heartbreaking when a loved one doesn't respond immediately to the truth of the gospel. And it's normal and even good to carry a burden for the loss, but many are carrying unnecessary weights of guilt, fear, and condemnation because they try to take on God's responsibility. Keep believing, never give up. But remember, you do the praying, leave the saving to God. Type, I trust you, Lord, in the comment section.