From Randy Newman’s book: Bringing the Gospel Home: Witnessing to Your Family Members, Your Close Friends, and Others You Know Well
1. If you don’t already have one, develop a system for prayer for your family. Perhaps you can set aside a section in a prayer journal.
2. Begin your prayers for your family with thanksgiving. This may be more difficult for some people than others. Regardless of your family’s well-being, thank God for the family you have and all the accompanying benefits you can identify.
3. You may need to include prayers of confession as well–confession of your lack of love for your family, your idolatry of control in trying to change them, your reliance on your ability to convict them of their sin instead of trusting the Holy Spirit to do that, your coldheartedness, haughtiness, and self-righteousness, etc. Ask the Holy Spirit to shine his light of truth on your darkness of sin.
4. If you haven’t already done so, “come out of the closet” as a Christian to your family. Pray for gentle words and a gracious demeanor mixed with bold confidence. . . . Aim for your announcement to be informational rather than evangelistic. You can trust God to open evangelistic doors later.
#3 nailed me.
One thing I might add, especially if you have a large family: look for opportunities in the course of the day when it is not so hectic where you might be able to enjoy a sustained conversation with a family member who is not a Christian. In a large group setting, conversations tend to stay on a superficial level, but if you can get alone with one or two family members for 10-15 minutes or longer, you will have a greater opportunity of magnetizing the conversation to the gospel and how Jesus has changed, and is changing your life.