Googled:
George Underhill, Bristol
and under the heading: Are you decended from George Underhill
from the Bristol Family History is this:
'The Bristol Mercury of 22nd July 1854 carries the following announcement: "Birth, July 15th at Limekiln Lane, to the wife of George UNDERHILL, varnish maker, a son. This makes the 30th child that Mr UNDERHILL has had born unto him. Sixteen of his progency survive and three are at present in the Navy, a respect in which they follow the example of their father who served his country in the last great war and was present at the Battle of Trafalgar."
By 1859, the same newspaper announces the arrival of the 33rd child!
Though the family was in Bristol by 1826 when a son Charles was born, George himself was born in Devon. At the time of the census of 1841 he was a varnish maker aged 55, i.e. born 1786, and his wife Ann was 45, (born c1796). Children at home were Charles, 15, Edwin, 13, Andrew 4, Thomas, 2 and Lettice,1. Because of the gap between the births of Edwin and Andrew, I believe Anne was his second wife. She died in 1844 and George married Mary Ann MAYNE, in 1848.
The family was living at No. 1 Limekiln Lane in 1851. George is now aged 64, "Greenwich Pensioner, varnish maker" born South Molton, Devon. As might be expected, his wife Mary Ann, at 25, born at Cannington, Somerset, the third Mrs George UNDERHILL, is less than half his age. The elder boys Charles and Edwin are missing, presumably at sea, as is the baby Lettice who sadly must have died, and the children living at home are Andrew, 15, Thomas, 14, William, 4, and Henry 1, once again showing the gap between the wives.
In 1855, Andrew was serving aboard HMS Nerbudda when she was last seen at Algoe Bay 10 June 1855. The Memorial with Andrew's name in the list is at the historic Simons Town Cemetery in South Africa, unfortunately a little defaced by graffiti:
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? George UNDERHILL married Ann OAKDEN - 16 January 1809, St Paul's Bristol