Not my family line, just sharing.
From the book "HISTORY AND BIOGRAPHY, COUNTIES OF WHITE AND PULASKI INDIANA. Historical and Biographical. Illustrated. Chicago; F. A. Battey & CO., Publishers. 1883."
page 409, West Point Township, White County, Indiana
"ROY D. DAVIDSON was born in Knox County, Ohio, December 6, 1828, and is the eldest of seven children born to WILLIAM and DELIA (SIMONS) DAVIDSON - ROY, JOHN, ELLIOTT C., JONAS W., WILLIAM H., DANIEL S. and CHARLES L.; JONAS, WILLIAM and DANIEL are dead. His father was born in Franklin County, Pennsylvania, February, 1801; was a farmer, held various offices, and took unusual interest in military affairs; he was dissuaded from taking part in the rebellion only by the urgent wishes of his sons, and on account of his age. All his sons, save WILLIAM, then deceased, were in the late war (Civil War). The father now resides in Hamilton County, Indiana. ROY's grandfathers were soldiers of the war of 1812. When twenty-one years of age, ROY DAVIDSON removed to Nicholas County, Kentucky, and thence to Boone County, Indiana. In 1869, he came to White County, Indiana, locating in Princeton Township, and in March, 1876, to his present home. On September 14, 1854, he was married to ELIZABETH STEPHENSON, by whom he had three children - WILLIAM R., NIMROD N. (deceased) and MARY E. MR. DAVIDSON now lives in the southwest section of West Point Township, on 160 acres, forty of which are one and a half miles north, and forty the same distance northwest of his residence. He makes a specialty of stock-raising. In July, 1861, he enlisted in the Twenty-fourth Kentucky Infantry, as Captain of Company I, and was engaged at Shiloh, Perryville, Stone River, siege of Knoxville, Chickamauga, Resaca and Kenesaw. Previous to his enlistment, he refused a major's commission from the Confederates - suggestive of true patriotism. He was wounded at Shiloh, and resigned in January, 1864. In May of that year, he re-enlisted in the One Hundred and Thirty-ninth Indiana Infantry, as Captain of Company A, and was mustered out in October, 1864. In 1877, MR. DAVIDSON served two terms successfully as Township Trustee, raising the township from bankruptcy. In 1882, he was appointed a Commissioner of Drainage for three years. He is a Mason, and a member of the Christian Church."