We Are All Completely Beside Ourselves by Karen Joy Fowler, 308 pages.
Rosemary tells us the tale of her broken family. Her brother Lowell left years ago and something happened to her sister, Fern. Rosemary doesn't tell us what right away, she lets her secrets out gradually. Fern was a chimpanzee raised as Rosemary's sister as part of her father's experiment.
Fowler tells of a time when this was a common sort of experiment with half-a-dozen animal-family experiments going on around the country. Lowell and Rosemary are left broken by the splitting of their family, and they both have to find a way to go on.
An engaging tale of family secrets, good intentions, and tragic results.