Hi there! I understand your frustration with your nephew's disruptive behavior late at night. Fortunately, there are a few workarounds that you can try to restrict his device using just your phone, without the need for root access.
1. Enable MAC address filtering: Most routers allow you to set up MAC address filtering, which allows you to specify which devices can connect to your Wi-Fi network. You can usually access this feature through your router's settings page. Find your nephew's device MAC address (you can usually find it in the device settings), and add it to the blocked devices list in your router settings.
2. Use a parental control app: There are several parental control apps available for both iOS and Android devices that allow you to restrict access to specific apps or websites, set time limits, and manage device usage. Some popular choices include Norton Family, Qustodio, and Kidslox.
3. Set up a separate guest network: If your router supports it, you can create a separate guest network and provide your nephew with the login credentials for that network. This will keep his device isolated from your main network and allow you to easily turn off the guest network when needed.
4. Change the Wi-Fi password: If you're unable to restrict access to a specific device, changing the Wi-Fi password will effectively disconnect all devices from the network. You can then provide the new password only to trusted devices, excluding your nephew's device.
Remember to discuss the situation with your nephew and explain the reasons behind your actions. Communication is key in resolving these kinds of issues. Good luck!