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So glad to hear from you. I do indeed have information on Horace and Mary. I have a copy of Mary's obituary, but not Horace's. If you'd like, I can mail you a copy of it.
Here is what I can tell you about Horace: Horace, Mary and their children came to Geneva, IL (approximately 35 miles west of Chicago) in 1865. Horace was a carpenter. They had three children: Claudia (also known as Kinnie - I have a copy of her obituary as well), Charles and Minerva. I don't have all of the research handy, my father is the keeper of this information and I will be visiting him soon. Somewhere in there I also have a copy of an 1898 Geneva Illinois Gazetteer. In it is Horace and Mary's address. Mary Burr's obit. mentions that Horace died in 1905, but does not mention where. I have found the graves of Henry Burr, both of his wives Abigail (first wife, died 1855) and Helen Alzina DeLong Burr, George S. Burr (a dry goods merchant) and his wife Irene. Henry and his family lived with George Burr according to the 1860 census. I have a copy of that as well. I think I may also have a copy of the 1870 census too.
I hope this is helpful. I can uncover some more for you when I visit my father within the coming weeks. He still lives near Geneva in the Fox Valley area and can probably uncover more information on Horace at the Geneva Historical Society. The Historical Society would be very interested in any Burr information that you'd be willing to share. Take care and thanks for your offer for help!