There are already super supportive people around here so I'm just gonna throw my bit in here, too.
If your BioParents aren't too tech savy it's actually pretty easy to bypass wifi restrictions whithout them noticing, if they restrict your IP adresses, you can just change your IP manually and bypass that. If they change the password, you can figure that out too. It's not much but as long as you can get physical acces to your router, you can ALWAYS find a way to get internet, physical access is root access, and there are lovely people in the internet that can show you how in your specific case.
Most definitvely not speaking from personal experience /s And if you need help with that, just contact me, I'll gladly help you, with everything actually
Can we skip right to Nürnberg this time around? We all know where this is going...