Looking for JAMES MCMAHON,[B/ILL.1851]

Parents: JOSEPH [B/PA.1815]/MARGARET A.?[B/VA.1826]Siblings: ELIZABETH [B/IA.1844]LEWIS E.[B/1857 BARTON CO.MO.]Lived in Labette in 1880s,probably a farmer. Possible he had two sons: Charles and Lewis W. and an u/k daughter[s].
Lewis W.McMahon lived in Cherokee,Crawford Co. in 1828 and was single at that time...Charles McMahon had a watermelon farm in Oklahoma. He also was single....trying to locate James farm in Labette and what happened to the family?