His Wikipedia page reports that, though he has two children, he was never married:

Silverstein had two children. His first child was daughter Shoshanna (Shanna), born June 30, 1970, with Susan Hastings. Susan Hastings died 5 years later, on June 29, 1975, in Baltimore, Maryland. Shoshanna's aunt and uncle, Meg and Curtis Marshall, raised Shanna from the age of 5 until her death of a cerebral aneurysm in Baltimore on April 24, 1982, at the age of 11. She was attending the Bryn Mawr School in Baltimore at the time of her death. Silverstein dedicated his 1983 reprint of Who Wants a Cheap Rhinoceros to the Marshalls. A Light in the Attic was dedicated to Shanna, and Silverstein drew the sign with a flower attached. Shoshanna means lily or rose in Hebrew.

Silverstein's other child was his son Matthew, born on November 10, 1983. Silverstein's 1996 Falling Up was dedicated to Matt. Matthew's mother is alleged to be the Sarah mentioned in the other thanks that appears on the dedication page.
Source(s):
http://en.wikipedia.org/wiki/Shel_Silverstein

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