I am 2nd cousin 4 times removed to William.I have a picture of the gravestone of William and Martha from Block Cemetery in Republic, Ohio.My great grandfather was Henry K. Neikirk, son of David F., gson of David, great gson of Michael.Your Diantha was my great grandfather's 2nd cousin. I also have a picture of Lucy's (Lettie) marker. She died young.The marker shows she died "Sept. 30 1865, aged 2 years, 1 month, 22 days."If you would like copies of these pictures I would be glad to send them to you.Have you ever been to Block Cemetery? Lots of Neikirks!!! I have researched the Neikirks extensively. Let me know if you would like copies of the pictures. Maybe we have other info. we can exchange.Hope to talk to you soon.