Doug- I did find a pretty close match for you. You will have to do some digging to find out for certain if this is yours or not. Fair enough?
1870 census of Clear Creek Twp, Drew Co ARKANSAS as taken on 8 Aug 1870: Silvanus RAINS, age 36, farm laborborn SC Sarah, age 40, SC William age 18 SC Nancy J age 16 SC Mary age 14SC Margaret 13SC Elisa10SC CHARLES8SC Sarah5SC
Do keep in mind that census takers often spelled names phoeneticly so the correct spelling is not necessarily Rains..could be Raines