It all starts when the storyteller tells Jill that it's high time she met Jack. The question is: Which Jack? "They're all called Jack around here," Mother Greenwood tells her. There's Great- grandfather Jack, Uncle Jack, Daft Jack, Jack the Giant Killer, and more, including, of course, Mother Greenwood's lazy, good-for-nothing, waste-of-a-wishbone son, Jack. The Jack stories are brimming wit…