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Male Calvin Woolworth Click to view Calvin Woolworth in the family tree

Calvin was born on June 2nd, 1845.1   Calvin's father was James Robert Woolworth and his mother was Sarah Mariah Yates.  His paternal grandfather was Jaspar Woolworth. He had four brothers and two sisters, named James Howey, Stephen Henry, Sylvestor Lenor, John Edgar, Emily and Sarah Mariah.  He was the fourth oldest of the seven children. He had two half-brothers named Stephen and Sylvester.1 

1 phelps.FTW
Further source/citation:
World Family Tree Vol. 1, Ed. 1 @ Tree #3857