What follows is continuing the pattern of being all over the place in terms of names, but I believe it could be the same folk as my reply #20. If I'm right, then both Clementina and Wilhelmina Melville converted to Catholicism in 1895 at St. Patrick's in Belfast.
The older Wilhelmina (my reckoning aged 15) was baptised on 16 September (birth year stated as 1880), her address was recorded as 106 Henry Street and her sponsor was a Martha Morgan. The younger 'Clementine' (my reckoning aged 9) followed suit a couple of months later on 29 November (birth year stated as 1884), her address was recorded as 73 Little Patrick Street and her sponsor was an Ann Russell. In both cases, they were described as protestant converts and their parents were transcribed as James Melville and Elizabeth Jane Kernaghan(?).
I can also see a St. Peter's Church version of the 1915 marriage of Clementina Donnelly nee Melville to Joseph Connor and both parents' names are included, transcribed as James Melville and Eliza Kernaghan (both deceased).