John and Susan had one son named Fred b 1875 d 2 apr 1875 in jackson co MI. So there were there at least in 1875 found a marrige date of 1 jan 1872place unknown but probably in MI or OH
found a death date for susan 7 mar 1900 in Green co. Oh other suppose that John died there also but date unknown
but they had 3kids married in Couyhoga co OH in the early 1900sso at some point they did go back to Ohio. I did find one Alfred Allen b NY living in Jackson co. MI who had a son John B. allen the right age. dont let the initial scare you off tho. sometimes those census takers could not read their own writing,however alfred and nancy are living in Muskegon MI in 1870. and john is still there. but in 1880 alfred is still there under A. A. Allen and john is gone from the house and there is no john the right age living in that county. could be a clue.