1996 was a split year for keyless entry systems on Jeep Grand Cherokee vehicles.
At the beginning of the model year, Grand Cherokees used a keyless entry system with infrared signal transmission. The remote for this system is a 2-button keyfob. The expensive Jeep (Chrysler) replacement remote is Remotes Unlimited part 659-1659 (link), but a less expensive replacement keyfob is also offered. Both of these replacement remotes are user programmable.
Later in the 1996 model year Jeep Grand Cherokee switched to systems with radio signal transmission. These systems used a 3-button remote control. The Remotes Unlimited part number for this keyfob is 362-1362 (link). Again, Remotes Unlimited offers both the Jeep (Chrysler) part and a less expensive alternative aftermarket remote. Unfortunately, these systems are not user programmable. They require an expensive computer “scan tool” for programming, so adding a new remote requires that you take your vehicle and all remotes to be used with it to a Jeep or Chrysler dealership for programming.
In case you are wondering, Jeep Cherokee vehicles only used one system during the 1996 model year. These vehicles used the infrared system with the 2-button keyfob (link).