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Male William Holbrook Click to view William Holbrook in the family tree

William was born in Weymouth Ma.1   William's father was Cornelius Holbrook and his mother was Experience Unknown.  His paternal grandparents were William Holbrook and Elizabeth. He had two sisters named Elizabeth and Abigail. He had a half-brother named Mehitable.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3132, 3132.ftw