From William Poundstone's biography of Carl Sagan:
Samuel Sagan was born in Kamenets-Podolsk to Louis Sagan and Etta Lisenbaum, who were quite poor. When Sam was about the age of five, he and his siblings left for the United States. They were sponsored by their uncle George, who was only about seventeen.
Samuel had a head of flaming red hair. "Red" and "Lucky" were his nicknames.
He married Rachel Gruber in Brooklyn on March 4, 1933.
from primary sources
In 1940 Census, he was working as a cutter of coats and suits. He and wife Rachel had one son, Carl, who was 5. The family lived at 8814 Bay Parkway, in Brooklyn.
↑ "United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KQ9L-BR5 : accessed 22 Aug 2014), Sam Sagan, Assembly District 16, Brooklyn, New York City, Kings, New York, United States; citing enumeration district (ED) 24-1796B, sheet 61B, family 176, NARA digital publication of T627, roll 2592.