outonalimb on Family Tree Circles

My search started 20 years ago. My uncle sent me some papers on my G.G.G.Grandfather Sylvester Maginity b. 1834 Westmoreland Co, Pa. I was excited to find he served in the Civil War. Still 20 years later I've not found his parents. I've added children to his family group sheet, and found their wives and children, but no sib or parents for Sylvester. Any and all help would be greatly appreciated.