Hi All

In my research into my Birney’s I have hit the proverbial brick wall

, and would appreciate any assistance.
In particular, what I am looking for is the following:
1. My Great Great Grandfather, John Birney’s Birthdate and Birthplace.
2. My Great Grandfather, Francis Birney’s second marriage to Lucy Mullin in 1895.
1. John Birney, was born c1820, John married Mary Duffy c1843 in Dun Laoghaire, County Dublin.
John and Mary had nine children, all born in Dun Laoghaire, County Dublin. John died in 1897 and is buried in Deansgrange Cemetery, Dun Laoghaire. John lived all his life in 13 Wellington St, Dun Laoghaire, informant was Luke Birney. Mary died in 1884 and is also buried in Deansgrange.
2. Francis was born 1850 at 13 Wellington St, Dun Laoghaire. Francis married Mary Grantham, 25 Apr 1878 at St Michael's RC Church, Dun Laoghaire. Francis occupation at the time of his marriage is listed as “Pilot” at Dun Laoghaire Harbour.
Francis and Mary had 8 children all born in Dun Laoghaire except for the youngest 2 who were born at North Dock, Dublin.
Mary died aged 38 in 1895, Francis remarried to Lucy Mary Mullin in 1897 and they went on to have 6 children, I would assume in the North Wall area of Dublin. Francis died at Grangegorman Hospital in 1926. Lucy died in 1955 in Dublin.
Francis and Lucy are both on the 1901 and 1911 census of Ireland, which states on both forms, how long they have been married.
I just find it strange that I cannot source their marriage registration.
Any assistance with John’s Birthplace and Birthdate, and Francis second Marriage would be greatly appreciated.
Kind Regards
David