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

Lavinia was born after 1766.1   Lavinia'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, Elvira, Hannah, Esther, Hulda and Royal.  She was the second youngest of the seven children.1 

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