IPhone 4s- forgot the password now it says connect to itunes?

This is my brother's old phone so it has his iTunes account on the phone and he's away for months and we can't contact him. My mum refuses to pay for it to be restored. I have tried connecting it to iTunes anyway and then it says it can't complete or something. I really need help x

One thing that I've been able to do is to connect it with the computer your brother may have done iPhone backups on. There's an option to restore the iPhone from the computer while the iPhone is connected

He doesn't have a computer

If you have your brother's apple Id and password, you can go to icloud.com on a computer, log in with the apple Id, then select Find My Iphone, click on All Devices in the top middle then erase the phone from here. You also have the option to place the phone into recovery mode through iTunes if the regular restore doesn't work. To use recovery mode, you connect the phone's USB cord to the computer, but leave the iPhone disconnected for now. Turn your phone completely off, then press and hold down on the phones home button while you connect the USB cord to the phone. Keep holding the home button until an alert shows up in iTunes on the computer asking you to restore the phone