That's amazing!Two weeks ago, we went to Ocean Park to have fun. We didn't want to leave granddad home alone, so we invited him to go with us. "Ocean Park is no fun for an old man like me,"he reponded. It took us half an hour to talk him into going with us. I can't remember how many times he yawned from the moment he stepped into Ocean Park but the show of the killer-whale in the Ocean Theatre changed his impression towards the whole trip. When he saw the tamer standing on the head of the giant whale, which was swimming faster than a speed-boat, he couldn't help exclaiming, " That's amazing!"

granddad 口语化指“爷爷”“外公”

to talk him into going 跟to persuade him to go 意思相同，解作“说服他去……”