What happens if, after being given up for adoption in childhood, you reestablish contact with your biological family -- only to discover that your newfound brother is a killer?

Anne Bird, the sister of Scott Peterson, knows firsthand.

Soon after her birth in 1965, Anne was given up for adoption by her mother, Jackie Latham. Welcomed into the well-adjusted Grady family, she lived a happy life. Then, in the late 1990s, she came back into contact with her mother, now Jackie Peterson, and her family -- including Jackie's son Scott Peterson and his wife, Laci. Anne...