William Redmond Lemon was my great great grandfather, born 3 Aug 1821, son of Thomas Lemon and Anne Barklie, farmer of Glenanne, Near Markethill, Co Armagh. He had an older brother Graham, born c 1819, and also Joseph (born c 1823-1827), James Henry, b c 1825, Thomas, b c 1827, Mary (1830-1901) and Sarah (22 July 1833 - 29 Sep 1888, married John Redmond of Cork) Dr William Redmond Lemon (1861 - 1927) was the son of Joseph and was a Physician and Surgeon in Markethill and later in Dublin.
Graham and William Redmond Lemon together founded the Lemon confectionery business in Belfast in 1842 (Donegal St) before moving to Dublin in 1850. Graham was married by now to Isabella (Surname?) and William married in Dublin in 1852 to Anne Dishon of Orkney. I have lots of records on William Redmond Lemon's family (and he is definitely not the same person as the one who married Dora Ross) In 1857 Graham and William seem to have had some sort of quarrel and go their separate ways - Graham appears to have prospered more than William! William initially remained in confectionery, but later is described as an engineer and eventually as an accountant (probably general business activities) William recieved the freedom of the city of Dublin in 1878, so must have been reasonably successful.
I know less of Graham Lemon's family, but he had a son Graham who died in infancy in Belfast (1846-1847). A second son, James Henry was a vet with the Royal Horse Artillery and died in India in 1872; next came another Graham, born c 1850, then Thomas Owens Lemon (1852-1917) who married Jane Adelaide Morriss, but had no family. There were also twins (a boy and a girl) born 12 Jan 1857. The only descendents that I know of, are those of Graham Lemon junior who had a son Thomas Owen (b c 1880) who had a son George Arthur Lemon, and 3 grandchildren. After the quarrel, Graham prospered, became a JP and had 2 large houses ; he also owned a large number of properties in Dublin that were rented out and he regularly entered into court cases for refusal to pay rates, damage to property etc. He died in 1886 and I believe his wife may have died in 1889. There are later reports of court cases in 1915 involving "Mrs Graham Lemon" but I think this must be the widow of Graham junior, although there are inconsistencies.
Maxwell Lemon is another mystery and I have a number of stories. First that Sadie Lemon (Sarah, not sure which one as we had several) married a man called Mullins and he took the name "Maxwell Lemon" and set up in competition. Alternatively, Maxwell O'Connor married "Miss Lemon" and took the name Maxwell Lemon. On the 1911 census, there is Maxwell Lemon, a widow (ie female), born in Scotland and boarding with a couple called Mullins. I think the fact that Maxwell Lemon is female is more likely and from a more reliable source, as there also seems to be a Maxwell Lemon connection back to Markethill, Armagh.
With the information on this website, I have delved further and found the funeral report for Graham Lemon (Oct 1886) and now know that he also had children, Captain G. G. Lemon and William H. G. Lemon - which I presume must be your William Henry George and the one who married Dora. (Could be one of the twins as I did not have names for these)
Need to try and find marriage and death certificate for Graham to check the name of his wife.