Bertha Levy m. Stern; Henrietta Levy m. Baum

Seeking ancestors and lost descendants of my husband’s great grandparents:
JULIUS STERN, who arrived in NY from Germany in 1888, and
BERTHA LEVY, who arrived in NY from Germany (possibly Delmenhorst) in 1890. (Bertha's sister Henrietta married Simon Baum.)
--Julius Stern married Bertha Levy August 7, 1892. His parents listed as Isaac Stern and Fanny Meierhoff. Bertha’s parents listed as Solomon Levy and Ester Henmann.
--Son Benjamin Isador Stern, born 1893 in NY, married Helen Newman, daughters Janet and Murel
--Son Albert Solomon Stern, born 1899 in NY, married Rose Gordon; sons Marvin and Robert.
--1900 census: lived on Bleecker Street, Brooklyn; profession: traveler cigars.
--1910 census: lived on Woodward Street in Ridgewood, Queens; profession: general real estate.

Any information would be appreciated.
--Donna Selig