One of the best ways to preach the gospel to yourself is to listen to and learn gospel-saturated songs. Sovereign Grace Music is a gift from God to us. They write and record songs that help us look upward to the all-sufficient Savior. I would encourage you to get one or two of their CDs and begin to learn some of these Christ-centered songs for the joy of your own soul.
Parents, serve your kids by teaching them solid theology through music.