p. 22 of the narrative of Dr. Neil Rosenstein The Margolis Family tells the story about Mordechai (Marcus) Margolis and the two sisters.

She was called Sophie / Sola / Sulka. She was the younger sister and married Mordechai circa 1880.

Mordecai (Marcus) was born in Przerosl in 1850, named for his great-grandfather who died in 1846. In June of 1870 he married his relative, Liba Hinda Sterling, by whom he had Samuel, Max and Jacob. She died about 1880 and he remarried her sister, Sola, by whom he had Solomon, Rose, Anne, Abraham, and Harry. About 1895 he emigrated with his family to Dayton, Ohio to join their cousins there.

Appears to have been called "Sofie" in the United States according to The Margolis Family book.

Sula SZTERLING from Przerosl according to Polish records of her children's birth on Jewish Gen.

The wives of Marcus Margolis (Mordechai) who are sisters are recorded as "Hilde and Sophie Sterling" in Dr. Neil Rosenstein's book. I don't know whether the last name was Szperling or Szterling in Polish, but presumably Szterling.

Ginda seems to have died in childbirth in 1878 when Chaim Berko was born to her and Mordechai (Marcus). Sula married Mordechai the same year as her sister died.

Source

Jewish Records Indexing - Poland (JRI-P) www.jewishgen.org

Marriage in Przersol in 1878 of

• KALWARYJSKI Mordchaj 1878 son of Ick (Isaac) and Risza GOLEDSZTOG. Film: 1,191,274
• SZPERLING Sula 1878 daughter of Abram and Mariasza Mowszowna. Film: 1,191,274