Let Steam update the game and then you'll have point and click ability in the game.
Since this is the version from Amazon -- a Steam installer on a disc and no game on the DVD -- it's probably already the newest version.
Maybe TLC just has to check the game options and see if there's an option for point-and-click (or something closer to it).
My Grandson will be disappointed, he was excited about a 3rd one coming out, its nothing like the first two.
I don't know how old Grandson is, but kids are usually better at learning new interfaces than older folk. If you can't get anything like "point-and-click" working, maybe get a small gamepad for Grandson and let him do the "driving."