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Male Silas Dewey Flagg Click to view Silas Dewey Flagg in the family tree

Silas Dewey was born on February 4th, 1818.1   Silas Dewey's father was Samuel Flagg and his mother was Rebecca Dewey.  His paternal grandparents were William Flagg and Abigail Black; his maternal grandparents were Simeon Dewey and Prudence Yemans. He had a sister named Mary Rebecca.  He was the older of the two children. He had a half-sister named Martha Jane.  He died at the age of 69 in 1887.1 

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 1, Ed. 1 @ Tree #3310, phelps.FTW, World Family Tree Vol. 4, Ed. 1 @ Tree #2332, 2332.ftw