Lost Main Man

I am looking for the brother that Joseph Main went to Iowa with in the 1850s. Joseph Main is the last son Of Nathan Maine who is a revolutionary war soldier and is buried in the cemetery he started on his home place in Crawford County, PA. Joseph and his wife Almira Partch Main are buried in Pleasant Hill Cemetery in Gage county Ne. You May find the links at http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Maine&GSfn=nathan&GSbyrel=in&GSdyrel=in&GSob=n&GRid=17402135&