 His family were active members of Congregation Baith Israel Anshei Emes in Brooklyn, joining when the synagogue was on Boerum Place, and remaining with it when it moved to Cobble Hill.Sidney's mother, Sophie, was sisterhood president from 1912 to 1913, his father, Pincus, served as president from 1919 to 1921, and the children all attended the Sunday school and Talmud Torah.Sidney married Helen W. Livingston there in 1920.