Looking for help in finding the birthplace (1870) or family line of my great-great grandfather, Joseph C. Sheldon, who died in Claire City, Roberts County, South Dakota in 1930. He was married to Gertrude Birdsall, daughter of Seth and Jennie Birdsall who was born in Ontario. I've been told that his mother had him out of wedlock or he was adopted, and raised by his grandmother. His mother married a Schielgen. He has Irish roots and came to South Dakota with his friend Al Feeney from Minnesota. He had four boys and one girl including my grandfather, Floyd Allen Sheldon, who married Marie A. Spethmann. Part or most of his family moved to Oregon during the depression after Joseph died of a brain tumor. Any information would be helpful. Thank you.