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Male Robert Davidson Click to view Robert Davidson in the family tree

1   Robert's father was William Carlisle Davidson and his mother was Diantha Jarvis.  His paternal grandparents were John Davidson and Rhoda Mudge. He had five brothers and four sisters, named Andrew Jackson, Lewis Cass, Oscar L, Ransom, William, Clarissa a, Harriett, Lel and Mary.1 

1 basel.FTW
Further source/citation:
World Family Tree Vol. 9, Ed. 1 @ Tree #2571