We are glad to know that you have a real burden and concern for your loved ones. God has laid this burden upon your heart, and He wants to work in their hearts and lives in response to your prayers.
God desires that all come to the place of repentance and salvation through faith in Jesus Christ. The Bible tells us that the Lord is "not willing that any should perish, but that all should come to repentance" (2 Peter 3:9).
The best thing you can do for your loved ones is to pray earnestly. We have the assurance of God's Word that "the earnest prayer of a righteous person has great power and produces wonderful results" (James 5:16, NLT).
It is the ministry of the Holy Spirit to convict of sin, to show the possibility of being made right in God's sight, and to warn of the danger of neglecting salvation (see John 16:7-11). The Holy Spirit will be faithful to do His work in response to believing prayer, seeking out those for whom the Lord has burdened someone to pray.
Pray specifically that the Holy Spirit will give you the opportunity to share the message of salvation with your loved ones, or will direct someone else to them. The Lord is able to do this as shown in Acts 8:26-39 and 9:10-18.
It is of great importance, however, that you permit the life and love of our Lord Jesus Christ to be seen in you. This in itself will be a tremendous testimony to unsaved loved ones and friends, and will prepare the way for a presentation of the Gospel. Jesus said, "Let your light so shine before men, that they may see your good works and glorify your Father in heaven" (Matthew 5:16, NKJV).