This is a record of a marriage between Avraham Sternbach and Freide Chajes: https://www.jri-poland.org/record?id=08d8a413-04bb-4217-8b26-19c6ce... It says that Avraham's parents are Uscher and Chaya, and Friede's parents are CHAJES Mordko Samuel and UHRMANN/CHAJES Taube.
This profile indicates that chaya's parents are friede's parents. This would mean that Avraham married his mother's sister. Seems unlikely to me.