How can I change the contents of grub loader?

I have Ubuntu installed alongside of Windows and in bootloader (grub) these operating systems as all of yours are with long names! How can I change the names in grub? for example I want to change the 4th one to "my fathers OS" and when I choose it in the grub it will go to the Windows.

Solution 1:

Try Try Grub Customizer

To install Grub Customizer in 13.04, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo add-apt-repository ppa:adabbas/1stppa
sudo apt-get update
sudo apt-get install grub-customizer

Once installed, search for it in Dash, and click on it

Once opened, right click on the desired item that you want to rename, and then click on Rename, once done, just save and exit.