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Male Samuel M. Alvord Click to view Samuel M. Alvord in the family tree

Samuel M. was born on July 4th, 1823 in Windsor, CT.1   Samuel M.'s father was Nathaniel Alvord and his mother was Eunice Strong.  His paternal grandparents were Jonathan Alvord and Elizabeth Reed. He had two brothers and a sister, and also a sibling of unknown gender, named Nathaniel, Elijah Strong, Elizabeth W. and Almira Enos.  He was the second youngest of the five children.1 

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