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Male Isaac Rumsey Click to view Isaac Rumsey in the family tree

Isaac was born in 1673 in Fairfield, CT.1   Isaac's father was Robert Rumsey and his mother was Rachel Frost.  His paternal grandparents were Robert Rumsey and Matilda Sherfield; his maternal grandparents were Daniel Frost and Elizabeth Barlow. He had three brothers and three sisters, named Benjamin, Daniel, Robert, Rachel, Abigail and Elizabeth.  He was the third oldest of the seven children.1 

1 phelps.FTW @ Tree #0259
Further source/citation:
World Family Tree Vol. 1, Ed. 1 @ Tree #0259