A very mixed bag here !!
Checked the Electrical reg in Pearse Library yesterday as promised. Eva/Georgina and John both come and go a bit. Broadly fits with what is know already - he is gone after '45 and she is at her parents home (Redcourt)
Now, on to the Donegans Edward, Mary and Gabrielle. From 1941 - 1951 they are all at 27 Philipsbourgh Avenue, Fairview and then they all disappear.
Not a sign anywhere !!! Tried everything I could think of. The database is very restrictive as to how you can search. Gabrielle is for the most part listed as Mary G but it won't allow you to search for a Mary G as it's not in the first name menu. Tried lots of things but couldn't find her or Edward and Mary anywhere after 1951 -62.
However the Philipsburgh Avenue address let me find this newspaper death record for Edward.
DONEGAN (Dublin) Nov. 19, 1959 at the Mater Hospital Edward, beloved husband of Mary Donegan and late of 27 Philipsburgh Avenue Fairview deeply regretted by his loving wife, daughter, brother, relatives and friends. R.I.P Funeral after 10 o'c. Mass from Church of the Visitation. Fairvlew on this Friday morning to Glasnevin.Thinking the burial record would give me a new address to search I couldn't stop myself buying the Glasnevin record - thinking I'd find her as informant with an address to follow up on but no informants were listed so my search ground to a halt there.
This is what the Glasnevin record said:
MARY DONEGAN , aged 83. Died 11th Aug 1960 - a Soap merchants widow of 27 Philipsburgh
Avenue. (No informant info)
EDWARD DONEGAN, aged 79. Died 19th Nov 1959 - a Soap Merchant - Royal Hospital for the Incurables. (No informant info)
EDWARD (EAMONN) DONEGAN, aged 3. Died 26 December 1919 - a Soap Merchants Child - 44 Marguerite Road, Glasnevin. (No informant info)
FRANCES GERTRUDE DONEGAN aged 26. Died 22 Jan 1915 - a Soap Merchants Wife - 7 St Patrick's Terrace, North Strand. (there is an image on this so she is Married, died in Child Birth and Informant was Edward Donegan of 5 St David's Terrace NCR)
JOHN DONEGAN, aged 49, died 8 December 1905 - Commercial Traveler - 8 Kings Inn Street. (this also had an image so he is a Widower, and informant is Edward Donegan of 8 Kings Inn Street)
Given the above I then looked for Mary's death in newspapers and found this:
DONEGAN (Dublin)—Aug. 11. 1960. at he Royal Hospltal for Incurables. Donnybrook, Mary Donegan; deeply regretted. R.I.P. Funeral after 10 o'c. Mass. on this (Friday) morning from the Church of the Sacred. Heart. Donnybrook, to GlasnevIn Cemetery.Obviously the newspaper's and Glasnevin records don't match up which I think is a bit weird.
I think this whole family is missing from 1901 which is a huge pity.
I presume the John that died in 1905 is Edward's father, Can't figure Frances Gertrude out - a sister maybe ??
I mailed Glasnevin to ask why no informants info was available for Mary and Edward and they came back to me today saying they don't have that information after 1920 and would require payment for an archive search.

So Hannah if you want to peruse that, you will need to create an account with them and buy credit and contact them again. I think they want €5 (per look up I think)
http://www.glasnevintrust.ie/genealogy/I'll pm you the details of the lady who emailed me back.