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Male Amasa Welles Click to view Amasa Welles in the family tree

Amasa was born after 1758.1   Amasa's father was James Welles and his mother was Hannah Loomis.  His maternal grandparents were Daniel Loomis and Hannah (Wetherell) Withrell. He had two brothers and six sisters, named Guy, Cyrus, Hannah, Betsey, Olive, Theodosia, Alice and Molly.  He was the fourth oldest of the nine children.1 

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