As you believe these folks to have been Quakers, it'd be a help to know why you do.....also, how you know birth and death dates. There's often a clue in where info has been found.Hinshaw's Quaker Encyclopedia doesn't containIndiana or MD record MM records, so the info would probably have to be found in individual meeting records. Do you know if they were married in Md or In? or where in Md? You might want to do some research and see what MMs there were near where these folks lived in In, and to then check with Earlham College, in Richmond, Indiana..(they have an online site).They have a lot of mid-western MM records.