ive got a g4 imac flat panel iMac that would be great for what you are looking for.
iMac G4/700 (Flat Panel) Specs (iMac Flat Panel, M8672LL/A*, M6498, PowerMac4,2) @ EveryMac.com
15" monitor - 368MB ram, 40GB hard drive - works fine.
my mom used this for the exact same reason you are looking for, for your parents.
im in toronto, and the computer is ready to be sold.
no box, and it comes with max osx 10.4 backup disks, i dont have the originals anymore.
would sell this for $150.
email me if you would like to see it -
ron.robichaud@rogers.com
im located in east york area, but can definitely travel to somewhere that isnt too far to show, and sell the unit.