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Female Elvira Burt Click to view Elvira Burt in the family tree

Elvira was born after 1761.1   Elvira's father was Noah Burt and her mother was Hannah Loomis.  Her maternal grandparents were Amos Loomis and Hannah Pomeroy. She had a brother and four sisters, and also a sibling of unknown gender, named Noah, Hannah, Esther, Hulda, Lavinia and Royal.  She was the oldest of the seven children.1 

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