Do not beleive that your dates are correct. Born 1840 died 1962. Suggest that you look at the 1890 or 1900 U.S. Census (the 1890 Census was lost in a fire) for your gggrandfather, wife and children. This will give you the names of his family members. The cemetery may also have information in their file as to who the mortuary was that handled the burial arrangements. Many times the mortuary and the cemetery have information in their archives that will also help you in your research. After you have gathered as much documented information that you can and clarified your dates you can go to The Family History Library (part of The Church of Jesus Christ of Latter-day-Saints, the Mormons). The folks in the library are all volunteers and many of them are also professional genealogist who will work with you no charge and point you in the right direction concerning all the material that they have available locally or from Salt Lake City. As referenced there is no charge for the use of the facilities or for their expertise, however if materials are requested from SLC then you will pay the postage charges for the microfilm rolls that you need for your research. They will NOT DO THE RESEARCH FOR YOU, only assist you and hold your hand and walk you thru all the steps necessary to find the information that you are looking for.