More information about the man would be helpful, since there are several people listed with the same name. The birth date of the man, place of birth, other family members such as wife, and date of marriage would be helpful. I did find a George W. Sidwell born in 1876, married to Clara Gidney born in 1872. Date of marriage is 30 May 1902 in Salt Lake City, Utah. He was born in Manti, Sanpete, Utah. She was born in Brigham City, Box Elder, Utah. I haven't found the date of death for this man. Another man, George William Sidwell, listed in the Ancestral File record of the LDS church web site, has his birth date as 13 January 1889. He was born in Nephi, Juab, Utah. He died, according to record, 3 August 1965. He was married to Lois Orilla Ewers. His father was Job Robinson Sidwell, and his mother was Rachael Sarah Wilkes. There is more information on this last man's family tree if he is the person you were referring to. I hope this helps you in your research. My email is: firstname.lastname@example.org
if you need the rest of the family tree.
Good Luck, Richard