Perhaps I'm just dense this afternooon (hope I didn't sleep through the sermon this morning), but I'm still not getting how this all fits together:
"On my grandfather birth certificate his father was David Condon born 1853 Limerick but can only find David Condon born 1852 and 1854 in Knockaderry Limerick.He was a bootmaker and married XXXXX XXXXX from Dun Laoghaire born 1850 Would one of these two be my great grandfather" and
"Sorry made a mistake David Condon was my grandmother, s father XXXXX XXXXX was my grandfather,s mother.David was a Bootmaker born in Limerick in 1853 not sure which parish could have been Knockaderry He married Emma Reader from Loose Kent XXXXX XXXXX was born in Dun Laoghaire in 1850 and married XXXXX XXXXX from Nova Scotia."
I think it will help if we just start over. You mention that you have your grandfather's (or perhaps it is your grandmother's) birth certificate. The place to begin is the child's full name on the birth certificate since it is his/her parents you are looking for (or I think that is your question). So what is the name, date and place of birth, parents' names, and anything else on the birth certificate?
Then, second, is it this child's parents that you are looking for?
I understand David Condon who was born in Limerick in 1853 and married Emma Reader from Loose, Kent.
I do apologize for my confusion.