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Female Martha Alvord Click to view Martha Alvord in the family tree

Martha was born on June 29th, 1747 in Northampton, MA.1   Martha's father was Saul Alvord and her mother was Martha Churchill.  Her paternal grandparents were John Alvord and Dorcas Lyman; her maternal grandparents were Joseph Churchill and Lydia Dickenson. She had two brothers and three sisters, and also a sibling of unknown gender, named Saul, Saul, Lydia, Ann, Eunice and Infant.  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 #0105, 0105.ftw @ Tree #0105