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

Jarvis was born on April 13th, 1798.1   Jarvis' 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, Orrin, Jess, William, Clarissa and Charlotte.  He was the third youngest of the eight children.1 

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