I think that there were two families here
Isaac MASON m Elizabeth STOREY on March 11 1833 in Wicklow Church of Ireland
They had at least five children
1834 George Francis Newcastle, Co. Wicklow
1840 Elizabeth Jane died 1843
1843 Rebecca Bray, Co. Wicklow
1844 Elizabeth Bray, Co. Wicklow
married Nicholas MIDDLETON Oct 11 1863 in Monkstown, Co. Dublin
1848 Victoria Frances Bray, Co. Wicklow
Cantwell's Memorials of the Dead shows a headstone inscription from Nunscross, Co. Wicklow that states:
Erected by Isaac Mason in memory of his beloved father George MASON
who died Oct 34th [sic] 1834 aged 60 years
also his mother Mary MASON who died January 9th 1836 aged 55 years
also Elizabeth Jane daughter of Isaac MASON
who died July 27th 1843 aged 3 years
Here also lie the remains of the above named Isaac MASON
who departed this life on the 12th of August 1850 aged 38 years
also Elizabeth wife of the above named Isaac MASON
who departed this life March the 2nd 1859 aged 44 years
It is highly unlikely that this Isaac MASON is the father of the Elizabeth baptised a Catholic in 1850 in Kingstown (now Dun Laoghaire)
There is a transcription on line of the marriage of
Elizabeth MASON - (F) Isaac MASON (M) Maria TOOLE - where did you get YORKE?
on Nov 19 1879 in Little Bray
to Richard HEALY of Rathmines - (F) Richard HEALY (M) Maria KEARNS
Witnesses: Tom MASON and Margaret CARROLL
I think that dathai is on the right track with Isaac MASON and Mary TOOLE
The baptisms of the two Bridget MASON's have TOOLE sponsors (however bearing in mind it was a common name)