Did you know if you soak a raisin in grape juice it turns into a grape? It's a Rock Fact. — Greg to Wirt, The Old Grist Mill. Gregory, affectionately nicknamed Greg, is Wirt's younger half-brother. He is a very energetic boy who always has a smile on his face and very wild ideas on his mind. He's endlessly fascinated by everything, including things that would normally seem scary such as the ghost in Mad Love. He has a habit of wandering out on his own. He has a pet frog, which he found before hi