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Male Abraham Hammer Click to view Abraham Hammer in the family tree

Abraham was born in 1731.1   Abraham's father was Johannes Hammer and his mother was Jane. He had a brother and three sisters, named William, Elizabeth, Mary and Hannah.  He was the youngest of the five children.1 

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