From the description:
"Perhaps the most autobiographical (and deliberately least disciplined) of Vonnegut's novels, Slapstick (1976) is in the form of a broken family odyssey and is surely a demonstration of its eponymous title. The story centers on brother and sister twins, children of Wilbur Swain, who are in sympathetic and (possibly) telepathic communication and who represent Vonnegut's relationship with his own sister who died young of cancer almost two decades before the book’s publication.
Vonnegut dedicated this to Stan Laurel and Oliver Hardy. Like their films and routines, this novel is an exercise in non-sequentiality and in the bizarre while using those devices to expose larger and terrible truths. The twins exemplify to Swain a kind of universal love; he campaigns for it while troops of technologically miniaturized Chinese are launched upon America. "
4.4 stars from 89 reviews (a low number, considering). 290 pages