There is a large group of researchers involved in the DISMUKE/DISMUKES search. I am also a DISMUKE. My great grandfather DISMUKE was from Oklahoma. My first suggestion about your father's family is to send for his social security application. It should list parents names and birth locations. Next, visit http://www.familytreemaker.com/users/b/a/r/Ginny-Barrs She has posted a great deal of information. If ayou have questions, please email me.