I was in Cavan again last month and looked again at the 1821 Census - there are only 3 surviving parishes, all in Co.Cavan being Denn, Crosserlough & Drumluman. A stroke of luck for us as it is the right area!!
I have found a Black Family in Drumbee? (difficult to read) in the Parish of Crosslerlough
Peter Black Age 54 Farmer Margaret Black Age 38 His Wife Flax Spinner Judith Black Age 17 His Daughter Flax Spinner Mary Black Age 10 His Daughter Anne Black Age 8 His Daughter
This Anne would have been born in 1813 and been 24 at the birth of John - do you think it could be the right family?I have to say I wasn't looking for the Black's but the name leap off the page at me.
I have found several Corr Families listed but I cannot be sure which one is actually ours but there are 2 very strong possibilites concerning names & ages in the area where I expected to find them.
I tried sending this direct to you on the email address I first replied to at IBM but it was returned, I hope that you have updated your email address otherwise I shall try and find you