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Female Mary Hammer Click to view Mary Hammer in the family tree

Mary was born on May 25th, 1723 in Cresheim, Philadelphia, Pennsylvania.1   Mary's father was Johannes Hammer and her mother was Jane. She had two brothers and two sisters, named William, Abraham, Elizabeth and Hannah.  She was the third oldest of the five children.1 

Family Details of Mary's family with Jacob Roller

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #0574, 0574.ftw