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

1   Fredrick Calvin's father was Stephen Henry Woolworth and his mother was Martha Powers.  His paternal grandparents were James Robert Woolworth and Sarah Mariah Yates. He had four brothers and three sisters, named Percival Hooker, Artie M., Earl, Leo Powers, Cordillia, Joyce and Lulu.1 

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