If Your talking about Legend Of Goku 2 then you'll get Grampa Gohans Key after defeating Coller on Planet Namek..try talking to all the Namekians on the planet one of them should give you the key
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Gohan's wife's name is Videl.
its the same as ssj gohans
Never mind.
I like trains.
In DBZ his girlfriends name was Videl. She was Mr. Satan's daughter.