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

Isaac was born on November 20th, 1722.1   Isaac's father was John Aldrich and his mother was Penelope Pray.  His paternal grandparents were Jacob Aldrich and Huldah Thayer. He had six brothers and four sisters, named Jeremiah, Joseph, John, Samuel, Stephen, Solomon, Rachel, Rachel, Ruth and Desire.  He was the fifth youngest of the eleven children.1 

1 phelps.FTW @ Tree #1309
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #0061, 0061.ftw