Lucas Watzenrode the Elder was registered in the Thorn citizen registry book (Thorner Bürgerbuch) as landowner, businessmen, judge, councilman, etc., living at Seglergasse in Thorn.
Lucas and his wife Katharina had a daughter, Barbara, who married Nicolas Kopernik.
Barbara's sister Christina married Tideman von Allen.
Copernicus had an uncle, his mother's brother, also named Lucas Watzenrode (known as Lucas Watzenrode the Younger), who as Bishop of Ermland strongly supported the independence of Ermland and helped raise Nicolaus and his brother Andreas after their father's death.
Their daughter Katharina Feldstedt married Herman Giese, born in 1523 in Danzig.