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

Cyrus was born after 1760.1   Cyrus' 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 Amasa, Guy, Hannah, Betsey, Olive, Theodosia, Alice and Molly.  He was the fourth 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