T.Y. Cotter's siblings
Ann Cotter... 1808 believed born Deptford but cant find birth or baptism. Could be Bantry.
The Southern Reporter and Cork Commercial Courier dated 25th August 1831 states “In Bantry 18th Inst by the Rev. T. Barry. G. Riordan Esq. of Kenmare Co. Kerry to Ann eldest daughter of Richard Cotter Esq. RN of Deptford”
The Roman Catholic Parish Church of Bantry records states that on the 18th August 1831 Garratt Riordan married Anne Cotter and the witnesses were Nicholas Riordan and Rogan Downing. Roman Catholic Parish Church of Kenmare County Kerry Ireland records two of their children’s baptismal sponsors as 18th May 1835 Margaret Anne daughter of Garrett Riordan and Anne Cotter Sponsor’s Michael Riordan and Jane Cotter. This could be Jane Lucy Cotter who emigrated to Australia in 1840 with her twin sister Ellen both baptised Church of England Chatham.
20th February 1853 Robert son of Gerard Riordan and Ann Cotter Sponsor’s William Cotter and Helen Cotter, this looks like William Cotter of Bantry and Helena Crowley 28th January 1826 Shanavalda Father Edmund Cotter and Cornelius Crowley
Pownall Pellew Cotter.. [Master 1841 then Staff Commander R.N. at death in 1866] was born on the 2nd June 1810 St Alphege Linton Road Woolwich Kent England and baptized on the 11th December 1811 at St. Mary’s Lambeth London. Master f HMS Terror under Captain Crozier on 1841 expedition to Antarctic. Cape Cotter named after him
James MacNamara Cotter... born on the 8th August 1813 in the Parish of Lambeth and County of Surrey, where his parents Richard and Ellen were to be found living at Fannington Lane Lambeth, and at St Mary's Newington Surrey C of E on the 13th of September that year. My wife's great great grandfather. Education Greenwich hospital School , apprenticed Merchant Navy then became Revenue Officer RN. He was named after Capt. james MacNamara who was Captain of Richard's first ship HMS Cerberus
Jane Lucy Cotter[Eldest twin] and Ellen Cotter [youngest twin] ...were christened 7th May 1815 Chatham Kent England C of E. According to an application to the Royal Naval Compassionate Fund in 1834, their mother stated that they were twins. They emigrated to live with Thomas Young Cotter in Adelaide in 1840 both married in there 1841.
Plummer Young Cotter.... was born in Ireland [most likely Bantry] in 1817 according to MN records at the UK National Archives. At the age of 11 he was admitted into the Greenwich hospital School 1828 to 1833 and to be apprenticed in the Merchant Navy. Most likely got his name from his great grandfather Plummer Young of Bantry. Last record I have is fireman on board steamship St George between Cork and Dublin in 1838.
Richard Cotter (Jnr.) was born on the 10th January 1830 [IGI Batch No.C009449] and christened at St. Paul’s church Deptford Kent England C of E. on the 2nd May 1830. He and his mother were not in the UK 1841 Census but were there in 1851.
Ellen Cotter, Head , Widow aged 62, Private [income] Born Ireland
Richard Cotter, Son, Unmarried, aged 21, Clerk to Ship Broker, Born Deptford Kent.
Richard emigrated to Australia in 1852, last known address 1853 residing at Sinclair No.167 Great Lonsdale Street East Melbourne
P.S. Beware Dr T.Y Cotter's biography on line from Australia and in the Lendon papers is full of errors regarding his life and his family's life before he emigrated in 1837.
Finally look up google books Sketches of Bermuda, or Somers Isles” printed by Effingham & Wilson of London; published by Richard Cotter the illustrations were done by Dr.T.Y. Cotter when he was 19 having sailed with his father as a junior clerk to Bermuda onboard HMS Antelope.