The author's name appears in print as "Kurt Vonnegut, Jr." throughout the first half of his published writing career; beginning with the 1976 publication of Slapstick, he dropped the "Jr." and was simply billed as Kurt Vonnegut. His older brother, Bernard Vonnegut, was an atmospheric scientist at the University at Albany, SUNY, who discovered that silver iodide could be used for cloud seeding, the process of artificially stimulating precipitation.
After returning from World War II, Kurt Vonnegut married his childhood sweetheart, Jane Marie Cox, writing about their courtship in several of his short stories. In the 1960s they lived in Barnstable, Massachusetts, where for a while Vonnegut worked at a Saab dealership. The couple separated in 1970. He did not divorce Cox until 1979, but from 1970 Vonnegut lived with the woman who would later become his second wife, photographer Jill Krementz.[2] Krementz and Vonnegut were married after the divorce from Cox was finalized.
He raised seven children: three from his first marriage; his sister Alice's three children, adopted by Vonnegut after her death from cancer; and a seventh, Lily, adopted with Krementz. His only biological son, Mark Vonnegut, a pediatrician, wrote the book The Eden Express: A Memoir of Insanity (Seven Stories Press, 2010),[22] about his experiences in the late 1960s and his major psychotic breakdown and recovery. Mark was named after Mark Twain, whom Vonnegut considered an American saint.[23]
His daughter Edith ("Edie"), an artist, was named after Kurt Vonnegut's mother, Edith Lieber. She has had her work published in a book titled Domestic Goddesses and was once married to Geraldo Rivera. His youngest biological daughter, Nanette ("Nanny"), was named after Nanette Schnull, Vonnegut's paternal grandmother. She is married to realist painter Scott Prior and is the subject of several of his paintings, notably "Nanny and Rose".
Of Vonnegut's four adopted children, three are his nephews: James, Steven, and Kurt Adams; the fourth is Lily, a girl he adopted as an infant in 1982. James, Steven, and Kurt were adopted after a traumatic week in 1958, in which their father James Carmalt Adams was killed on September 15 in the Newark Bay rail crash when his commuter train went off the open Newark Bay bridge in New Jersey, and their mother—Kurt's sister Alice—died of cancer. In Slapstick, Vonnegut recounts that Alice's husband died two days before Alice herself, and her family tried to hide the knowledge from her, but she found out when an ambulatory patient gave her a copy of the New York Daily News a day before she herself died. The fourth and youngest of the boys, Peter Nice, went to live with a first cousin of their father in Birmingham, Alabama as an infant. Lily is a singer and actress.
Jane Marie Cox later married Adam Yarmolinsky[24] and wrote an account of the Vonneguts' life with the Adams children. It was published after her death as the book Angels Without Wings : A Courageous Family's Triumph Over Tragedy.[25]
On November 11, 1999, the asteroid 25399 Vonnegut was named in Vonnegut's honor.[26