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Female Theodosia Gilbert Click to view Theodosia Gilbert in the family tree

Theodosia was born on August 9th, 1767.1   Theodosia's father was John Gilbert and her mother was Theodosia Marsh.  Her paternal grandparents were Benjamin Gilbert and Elizabeth Marshfield; her maternal grandparents were Jonathan Marsh and Theodosia Kellogg. She had four brothers and three sisters, named John, Giles, John, Hiram, Esther, Elizabeth and Chloe.  She was the oldest of the eight children.1 

Family Details of Theodosia's family with William Cook

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