1. Margaret Lucy MEADE/NEAD was born about 1802 in Dublin. She died 19 Nov 1868 in 29 Haymarket, London.

We know that Margaret was born in Dublin from the 1851 census of England and we have an idea of her surname from the birth certificates of her twins, Margaret and Thomas, on which it appears to be 'Nead', a very unusual but not unknown surname in Ireland. However on the birth certificate of her daughter Mary Ann, Margaret's surname appears to be 'Made'. Made could also have been a pronunciation of the relatively common Irish name Mead (back then it wasn't unusual for names to be spelled as they were locally pronounced, such as Clary for Clery, Ragan for Regan, etc.). Variations of Nead and Mead appear to be Neade and Meade respectively, with Meade being a more common spelling than Mead.

It's a long shot but it's possible Margaret's father's first name was Robert and her mother's Lucy because baptismal records have been found on the Irish Genealogy website www.irishgenealogy.ie for three children of a Robert and Lucy Mead/Made in (the Catholic) St. Andrew's parish in Dublin. While none of the children is named Margaret, Margaret's middle name is Lucy, one of her children was named Robert and the name of one of the baptismal sponsors is Maria Anna Butler (Margaret would marry a George Butler). Although this is no evidence whatsoever of a connection between Margaret and the family of Robert and Lucy Mead, just in case there is a link, here are the details from the Irish Genealogy records:

Louisa Mead (sic), baptised 1809, sponsors Andrew OHalen (sic) and Maria Anna Butler
Robert Meade (sic), baptised 1810, sponsors Francis McDermott and Anna McDermott   
Robert Made (sic), baptised 1811, sponsors Francis McDermott and Anna McDermott (either there is an error or the first Robert had died)

Margaret and her husband moved from Dublin to London around 1830. According to both the 1841 and 1851 censuses of England, Margaret, George and their family were living at 1 Francis Court in the parish of St. Paul, Covent Garden in Westminster. By the time of the 1861 census, they were living at 57 Greek St. (where their musical instrument business was located) in the parish of St. Anne in Westminster and at the time of Margaret's death in 1868 they were living at 29 Haymarket (again, the address of their business). Margaret died from 'dropsy', an old term for the 'swelling of soft tissues due to the accumulation of excess water, often due to congestive heart failure').

In case Margaret's surname was the unusual name of Nead (or Neade), a search of Irish civil registration records on the FamilySearch website shows small concentrations of Nead families around Delvin, Co. Westmeath (which has by far the highest number of records); Strokestown, Co. Roscommon; Dublin; Roscommon town; Mullingar, Co. Westmeath; Carrick-on-Shannon, Co. Leitrim; and Ballyvaughan, Co. Clare.

Griffith's Valuation (1847-1864):  Michael Nead, occupier of land in the parish of Cloonygormican, Co. Mayo; Julia Nead, occupier in the parish of Killulagh in Co. Westmeath
Dublin City Census (1851): Pk. (Patrick?) Neade, 1 Hammond Lane in the parish of Michan's in Dublin; Jno. (John?), 17 Hammond Lane in St. Michan's

1841 Census of England: Mary Nead, Liverpool, born c.1791 Ireland; Michael, Croydon, born c.1821 Ireland
1851 Census of England: Catherine Nead, born c.1813 Co. Cork, married to English-born Thomas Nead; James Nead, born c.1824 Mayo and his wife, Elizabeth, born c.1811 Cork, living St. Pancras, London
1861 Census of England: No Irish-born Neads recorded
1871 Census of England: No Irish-born Neads recorded
1881 Census of England: Ann Nead, born c.1830 Ireland, married to English-born John Nead, living Wigan; Thomas Nead, born c.1824 Ireland; his wife, Eliza, born c.1819 Ireland; their son Michael, born St. Pancras, all living St. George, Bloomsbury; James Nead, born c.1857 Ireland, lodger in Cumberland; Thomas Nead, born c.1861 Ireland, lodger in Cumberland
1891 Census of England: Julia Nead, born c.1818 Co. Cork, living Shoreditch
1901 Census of England: Joseph Nead, born c.1864 Ireland and his wife, Mary, born c.1856, living Sale

Monica Evans in the UK has kindly provided me with some information on the family of her father, Patrick Neade, who was probably born in Drogheda, Co. Louth. Patrick's father, also named Patrick, whose date and place of birth are unknown, married Clare Bannon in the 1900s and they had five children:
Patrick (1909-1977)
John (1910-1983)
Mary (c.1914-2002)
Clare (c.1920-1982)
Annie (1922-1977)
It's believed the eldest three children were born in Drogheda and the youngest two on a farm in Williamstown, Delvin, Mullingar, Co. Westmeath where Patrick and his family settled after serving with the British Army during World War I. All five children emigrated to England. During World War II Patrick and John found engineering work at a factory near Gloucester; Mary and Clare worked for the American Red  Cross, both marrying American soldiers and moving to the United States where they raised families. Patrick married in 1952 and Annie about 1955. Both had families. John never married and returned to Williamstown following the death of his father in 1955. Clare (his mother) died in 1969 and John in 1983. All three are buried in the same plot in the cemetery at Williamstown church.

Margaret married George James BUTLER in probably about 1825 in probably Dublin. George was born about 1795 in Dublin. He died 8 Apr 1870 in 29a Haymarket, London.

The farthest back we can trace our Butler family is to George Butler, a musical instrument maker, who, according to William Waterhouse's 'The New Langwill Index: A Dictionary of Musical Wind-Instrument Makers and Inventors' (London, T. Bingham, 1993), "flourished in Dublin from 1826 as a successor to a Mr. Dollard, maker of flute, Kent-bugle, serpent and bass-horn". "The New Langwill Index" lists Algernon Rose's 'Talk with Bandsmen' (London, 1894; reprint ed., London: T. Bingham, 1996) as a secondary source for George. According to Mr. Rose, George "succeeded Mr. Dollard, who set up in Dublin about the year 1810."   

It appears George moved to London probably in the late 1820s or early 1930s while still maintaining the business in Dublin. Our estimated time of George's move is based on the fact that his eldest child was born in Dublin about 1826 while the fourth, born in 1834, and subsequent children were all born in London (we're unsure as to the place of birth of the second and third children). It seems George worked for others in London for a number of years (the 1851 census of England shows that George, along with his son George, was working as a "journeyman trumpet maker"), but in 1859 it's believed he set up his first London shop at 17 Brydge's St. in Covent Garden. According to Algernon Rose, "Mr. Butler's business was established in the Haymarket in 1826" but it seems more likely that this may have been the year he started working in London; according to the "The New Langwill Index", the Haymarket business wasn't set up until 1865.

In Dublin it's possible George's workshop was located for a time on Capel St. because the only Griffiths Valuation entries for a George Butler in the entire city of Dublin are for (i) 155 and 156 Capel St (warehouse, house, warerooms and small yard) and (ii) an address on what seems to be a lane between 13 and 14 Strand St. Little (just off Capel St.) where an office was rented. Part of Strand St. Little runs behind shops on the river end of Capel St. where numbers 155 and 156 are located. Griffiths Valuation was undertaken for the Capel St. area in May of 1854.   

According to his death certificate, George died of "debility from age".

The Butler surname is Norman in origin and used to mean 'wine steward'. The name has the same root as the modern French "bouteille" meaning 'bottle'. The name was then extended to denote the chief servant of a household and, in the households of royalty and the most powerful nobility, a high-ranking officer concerned only nominally with the supply of wine. In Ireland most of the Butlers are descended from Theobald Fitzwalter, brother of the Archbishop of Canterbury, who was created Chief Butler of Ireland by Henry II in 1177. The huge territories he was granted were mainly in counties Tipperary, Limerick and Wicklow.