1900 Census lists Louis’s father as Samuel (Daniel) Ostrow born January 1875 in Russia. Immgrated 1890. Becca Ostrow born February 1877 in Russia. Immigrated 1890. Louis Ostrow born February 1897 in Pennsylvania, Helen Ostrow born 1899 or 1900 in Pennsylvania, Pierson Bernard Ostrow (1913-1967).

Living at 613 Watkin Street. Louis’s parents married in 1896. Daniel (Samuel) Dressmaker. Daniel’s father was Aaron Ostrovsky (1850-1936), Mother Sarah Harrison (1852-1926). Aaron and Sarah had three children, Daniel Ostrow (1876-1929), Clara Ostrovsky (1877-1953) and Sarah Harrison (1852-1926).