Praying God will use this opportunity to save your nephew. I have often seen God use many people, and many circumstances to bring people into the Kingdom of God. Like the parable of the soil, you may have tilled dry, hard grown. Maybe you sowed the seed. Or perhaps you watered or weeded his heart. In the end, God can use all these encounters to draw people to him.
Faithful obedience shared the gospel, which you have done. I pray God will I unharden Anthony's heart, and he will be saved by the power of the Holy Spirit. There is nothing more important for an unsaved person!