For most Church employees, paystubs can be found at AtWork.ChurchofJesusChrist.org. You will need to sign in using your grandson's Church Account. However, I don't know specifically if that's the right website for Deseret Industries employees. If that doesn't work, you may need to get in contact with his manager at your local Deseret Industries, who will know the process for accessing paystubs.
Samuel Bradshaw • If you desire to serve God, you are called to the work.