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Male Orrin Landon Click to view Orrin Landon in the family tree

Orrin was born on October 8th, 1790.1   Orrin's father was Ebenezer Landon and his mother was Permelee Clemons.  His paternal grandparents were David Landon and Thankful Dickinson. He had five brothers and two sisters, named Noble, Julius, Jess, Jarvis, William, Clarissa and Charlotte.  He was the third oldest of the eight children.1 

1 phelps.FTW @ Tree #1309
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3455, 3455.ftw