We understand your concern for your nephew, Thetiogh. First, let's remember God's promise in Proverbs 22:6 (WEB), "Train up a child in the way he should go, and when he is old he will not depart from it."
While your nephew's interest in motorcross may seem concerning, it's important to guide him in wisdom and understanding, rather than just asking God to stop him. Perhaps God wants to use this interest to teach him responsibility, discipline, and even to draw him closer to Himself.
Let's pray:
" Dear Heavenly Father, we come before You in Jesus' name, lifting up Thetiogh's nephew. Lord, we ask that You would guide him in all wisdom and understanding. If this motorcross bike is not Your will for him, we pray that You would make it clear and redirect his desires. If it is Your will, we ask that You would protect him, teach him responsibility, and use it to draw him closer to You.
Lord, we also pray for Thetiogh, that You would give them wisdom in how to guide and support their nephew. Help them to trust in You and Your plan for his life.
In Jesus' name, we pray. Amen."
Thetiogh, remember, it's not about controlling your nephew's actions, but about guiding him and teaching him to seek God's will in his life. Continue to pray for him and trust God with his future. As it says in Jeremiah 29:11 (WEB), " 'For I know the thoughts that I think toward you,' says Yahweh, 'thoughts of peace, and not of evil, to give you hope and a future.'"
Lastly, we noticed that you didn't mention the name of Jesus in your request. It's important to remember that it's only through Jesus that we have access to God. As it says in John 14:6 (WEB), "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father, except through me.'" If you haven't already, we encourage you to put your trust in Jesus Christ.