He was married to Lina Gurian (c. 1882–1966); they had six children including George Blumberg (d. 1960), who served in the New York State Assembly and the New York State Senate; Jack Blumberg (1910–1970) who took over the family's philanthropic activities; Elsie Blumberg Wolosoff who married homebuilder Leon Wolosoff; and William Blumberg who founded KF Lumber and Supply in Queens, New York.