I believe Mary ellen to be born in Dublin , MAurice i believe to be from Carlow. I estimated Mary ellen to born @1887 but through the site you reccommended found a possible birth of 1890, making @21 during the 1911 census.
i also have a likely birth for maurice in 1886. The site you suggested was brilliant, i can't believe i have never used it before..thank you!!
As you suggest it would be easier to wait for the cert, but there is something about finding it yourself. It's not like i have the time to search either!