I am related to Peter Derr and Mary Brinley. Peter is my great great great grandfather. He is buried in Hardin County, Ohio with Edward Davis Derr (my great great) and Martha Johnson Derr. I have that Peter was born in 176 and died in 1849 and that Mary was born in 1770 and died in 1851. I have also seen that as 1831 and that Peter married a second time and that is why Mary is not buried in Ohio with him. I love more information about this family.