~not related~
They were in Hendricks, Chautauqua Co., in 1880.
Samuel was in Lowell, Cherokee Co. in 1870.
I could not find either one in the 1875 ks state census.
So I would try one of those two counties.
Surnames;Delaplain, Leavitt, Perkins, Caldwell, Covault.
Allen Co.