Jan 1920 Census, David Tannenbaum (27), brother-in-law, is with Abe W. King (27), Sadie King (23), and their son Earl J (1-1/12) in Chicago Ward 27
20 Jun 1920 David Tannenbaum (age 27) married Barbara Zable (age 22) (lic#0870292) (ancestry.com)
Apr 1930 Census, "David E. Tannenbaum" (age 37), grocer, wife Barbara (age 31), dau Jane M. (8), son Howard (2-4/12) in Chicago Ward 40 (4130 N. Kimball)
"H. David Tannenbaum. 15 Jun 1892. Chicago, Cook, Illinois. Male, white, American. Father: Hermann Tannenbaum, age 28. Mother: Lena Leddmann Tannenbaum, age 21. FHL film 1287929" (from ancestry.com)
"David Tannenbaum, age 24, 2630 Crystal St., Chicago, Ill. Born 15 Jun 1892. Natural born citizen, born in Chicago, Ill. Self-employed in wholesale/retail produce, at 1059 No. California Ave., Chicago. Father and mother dependent on 2 sons. Single, white. Med height, med build, blue eyes, brown hair, not bald, no missing limbs." (image viewed on ancestry.com)