I know of no connection between Reuben ALEXANDER of Fremont County, Iowa and the LEEKA family. However, Reuben was a brother of my ancestor, Mary (Alexander) TURK, who eventually settled in Grundy County, Missouri. I do not know all that there is to know about her siblings!
I do know that Reuben was in Peoria County, Illinois in 1850; in Appanoose County, Iowa in 1860; and finally in Fremont County, Iowa where he died in 1885. His children were Similda and June by his first wife (Mrs. Mary Ann (Ralston) Alexander - widow of an older brother; Alice, Edwin, Elizabeth, John Charles, Lena May and Emma by his second wife (Keziah Wise Criswell).