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Male Roswell K. Lyman Click to view Roswell K. Lyman in the family tree

Roswell K. was born on February 5th, 1815.1   Roswell K.'s father was Asa Lyman and his mother was Sarah R. Davis.  His paternal grandparents were Richard Lyman and Philomelia Loomis. He had four brothers and four sisters, named Richard, Asa, William D., George, Ziba H., Sarah, Mary A. and Clarissa.  He was the fifth oldest of the nine children.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