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

Theodosia was born after 1761.1   Theodosia's father was James Welles and her mother was Hannah Loomis.  Her maternal grandparents were Daniel Loomis and Hannah (Wetherell) Withrell. She had three brothers and five sisters, named Amasa, Guy, Cyrus, Hannah, Betsey, Olive, Alice and Molly.  She was the third youngest of the nine children.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3669, 3669.ftw