I am also researching the Bocian side. Mary is my great-grandmother's sister. My great-grandmother was Victoria Bocian. Mary and Victoria had other siblings: Florianna, Kattie, Stanley, Frank, and Stanislava. Florianna (Flora) married John's brother Joseph.
Mary's father's name was Ludwig/Ludwick/Lewis and her mother was Josephine/Jozefa. Josephine's mother's name was Maryanna Malkouska.
Of course all Polish names have a million variations. I am stuck at Ludwick Bocian and also from Josephine's parents side. I would love to get any/all information that you have.
Exerpt from her death certificate:
Name: Mary Jureuisz
Titles and Terms (original):
Death Date: 19 Jan 1923
Death Place: Chicago, Cook, Ill.
Race or Color:
Estimated Birth Year: 1885
Birth Date: 29 Aug 1884
Birthplace: Chicago, Ill.
Father: Ludwik Bocian
Father's Titles and Terms (original):
Father's Birth Place: Poland
Mother: Jozefa Malkouska
Mother's Titles and Terms (original):
Mother's Birth Place: Poland
Spouse: John Jureuisz
Spouse's Titles and Terms (original):
Burial Date: 23 Jan 1923
Cemetery: Holy Cross
Digital Folder Number: 4204755
Image Number: 1720
Film Number: 1877163
Volume/Page/Certificate Number: rn 1652