Patrick Daly was a son of Denis Daly and Ellen Sullivan of Drimoleague, Co. Cork, Ireland
Mary T Martin was a daughter of George T. Martin and Julia Hughes of Brentford, Middlesex, England

Patrick Daly and Mary Martin married in Q2 of 1913 in Brentford, Middlesex, England

Patrick was a gardener who worked at Kew Gardens

Patrick added the O' to his surname to become O'Daly. Of course there was the O’Daly Bardic School from 13th to 17th century in Dromnea, Kilcrohane, West Cork. The modern Irish surnames O'Daly, Daly, Daley, Daily, Dailey and Dawley are derived from Ó Dálaigh.  At the beginning of the 20th century with an increasing desire for independence from England many Irish people added the O' to the English version of their surname from the original Irish name and it seems that Patrick did similar from the original Ó Dálaigh to Daly to O'Daly.

Children born in Brentford, Middlesex:

Patrick Brendan Denis O'Daly, 10 April 1914.

Sheila Ellen Brigid O'Daly, 13 April 1916.  married John McNeill in 1962 in Ealing, Middlesex.  Sheila died in Brixham, Torbay, Devon on 27 July 1993. No family

Kieran John J O'Daly, 20 February 1919.  married Josephine Bertha Calnan in 1952 in Ealing.  Kieran O'Daly died in Torbay, Devon in Feb 1985; Josephine Bertha O'Daly of 21 Holwell Rd, Brixham, Devon died on 22 Feb 1979.  Probate Bristol on 15 June 1979. 

We read about Patrick on the site "Remembering the men who said no"   https://www.menwhosaidno.org/men/men_files/o/o'daly_patrick.html
which has the following text:

"PATRICK O'DALY 1876 - Patrick O'Daly was one of many Conscientious Objectors who held several grounds for objecting to war and conscription. While working as a gardener at the Botanic Gardens, Kew, he applied for exemption as a Conscientious Objector at the Brentford Tribunal. His hearing was in late June 1916, having avoided call-up earlier due to his age - at 40, he was near to the extreme end of the age range Conscripted under the Military Service Act 1916. He made his stand on several grounds, stating that "I am a Catholic, an Irishman and a Socialist, and hold all war to be organised slaughter and commercial rivalry". His application was for absolute exemption, and he made it clear that he would not accept any compromise, seeing his then employment as the most useful service he could offer to the country. His Tribunal was unsympathetic, possibly due to the fact that it was manned largely by Patrick's "political opponents" as he remarked he had "been a rival with two of the members for a seat on the council" and had publicly disagreed with them on matters of local and imperial politics. Given these conditions, it's unsurprising that Patrick's application for exemption was rejected. His uncompromising resistance to militarism led him from arrest, to court martial to prison, where he would remain for the rest of the war."

From https://discovery.nationalarchives.gov.uk/details/r/C14091674 we can view:

1939 England and Wales Register:  The family were at 24 Orchard Road, Brentford

Death:
Patrick O'Daly died in Q1 of 1942 at Brentford.  From his death record he was aged 65 years.

Visiting Deelish - Kieran O'Daly on horseback with cousins Brendan and Pat Joe of Deelish either side