Grapefruit was revived by the scientist to become Frankenfruit and survived the Halloweenie's attack, later getting beaten up by Midget Apple, helping Orange annoy CornCob, bullying Marshmallow, and getting defeated by Coconut. He is the main villain of the show.
Grandpa Lemon was also turned into Frankenfruit and was NOT killed by Halloweenie. He slept through Orange's Christmas wish, saved his own life, saved Midget Apple, annoyed CornCob, and got captured by Coconut.
Both characters are still alive now.