This looks like it could be your folks.Should get you started anyway.
1880 District 9, District 5, Bradley Co TN Census 523 523 Atchley, John w m 28 m farmer TN TN TN , Malinda w f 30 wife m keeps house TN TN TN , Elijah w m 8 son s TN TN TN , Seth w m 7 son s TN TN TN , Navada w f 1 daughter 1 TN TN TN
From: Tennessee Marriages 1851 - 1900 by Dodd: John Atchley married Nancy M. Grisham 25 July 1867, Bradley Co TN
1870 District 1 Meigs Co TN Census 102 102 Atchley, Seth 57 m w farmer 6000 800 TN , John M 20 m w farm laborer TN , Malinda 22 f w house keeper TN , Benjamin 1 m w TN
1860 District 1, Meigs Co TN 114 114 Little Atchley 47 m farmer 7000 996 TN , Mary F 18 f house keeper TN , G R 15 m Apt keeper TN , Sarah J 14 f TN , Martha 12 f TN , John M 9 m TN
1860 District 9 Bradley Co TN 1175 1175 Grisham, Richard 30 m farmer TN , Lisa 28 f TN , Betsey 14 f TN , Nancy 12 f TN , Benjamin 10 m TN , Harriet? 6 f TN , Austin 3 m TN
There is quite a bit of information on GenForum on Seth "Little" Atchley on.I found some things on a recent trip to the Sevier County Genealogy library too.The line I follow is a different Seth Atchley (brother to Amos). Deb