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I see your point!  Sampson Harris was born 1812 in Devonport and baptised Stoke Damerel, son of John Harris, a smith by trade and Elizabeth (Hicks?).  By 1849 Sampson was an engineer in the Royal Navy so obviously joined quite some time before that although the records I have start there. 
He had a daughter with Charlotte Augusta Ryan, Sarah Hannah who was baptised in
Stoke Damerel in 1838, she married twice and died in Wandsworth in 1891 and was buried in Norwood cemetery.
Sampson's son Sampson Edward was born in 1849 in Woolwich and baptised there in the same year. Sampson Edward was in the Greenwich hospital school in 1861. He was married in Plymouth in 1870 to Elizabeth Viney Simpson. Sampson Edward was also in the navy and he and his six children, Armeda Cecilia, Sampson John George, Frederick Henry Viney, Cecil James Viney, Gwendoline Melita Viney and Lilian Mabel Viney Harris ended up in Portsmouth where he died in 1916.
Sampson's son Frederick Horatio Harris was born in 1851 in Wood Street, Mile Town, Minster, Sheppey and baptised in Sheerness in 1852. In 1861 he was living with his father and stepmother in Plymouth.  Frederick was a chemist or worked for a chemist all his life.  He married Elizabeth Phoebe Woodbridge in 1873. She was born 1850ish, age at marriage, father George Louis Woodbridge, can't find them yet.
In 1883 he married Mary Ann Hardy Fordham and had Sampson Charles Frederick, James Hotatio John, Alexander George Vincent and Charles Augustus Sydney. In 1892 he married Sarah Jane Elizabeth Dolman and had Freda Jane Mary and May Emma Charlotte. He died in 1912 in Bermondsey.
Sampson's son James Richard Harris was born 1852 in Chapel Street, Mile Town, Sheerness and died 1859 Chapel Street, Tavistock.
Sampson's daughter Elizabeth Ann was born in 1853 in Chapel Street, Mile Town Sheerness and in 1861 was with her brother Frederick Horatio and father and stepmother in Tavistock.  She married George Augustus Coutney Webb in 1871 in Stoke Damerel and had Bessie Isabel Maud before being divorced by him.  She then married Albert James Walter Neville in Portsmouth in 1886 and had Guy and Cecily Neville.  She died in 1930 in The Isle of Wight.
It was only when I discovered Elizabeth Ann and Frederick Horatio and sent for their birth certificates that I discovered their mother's name was Ryan.  These were photocopies of the original whereas that of Sampson Edward had been transcribed wrongly as Rayn.  I have looked for the marriage as Rayn and Ryan.
Charlotte Augusta  in 1854 in Chapel Street, Mile Town, Sheerness.  I have looked for them in Sheerness in 1851 with no success.
Sampson was married in 1858 in Tavistock to Mary Maunder, presumably poor Sampson Edward was one child too many to care for and was sent to the Greenwich hospital school. His big sister Sarah Hannah was at boarding school in Woolwich in 1851, can't find her in 1861.
Sampson's son Charles Joshua Joseph was born in 1861 in Plymouth and he went on to be a surgeon and died in 1939 in Ennerdale.  He had been awarded a medal for his work in a mining accident.  Mary Hannah Harris Sampson's daughter was born in1863 and died in 1868 in Plymouth and Sampson George Victor, yet another Sampson, was born in Plymouth in 1865 in Plymouth.  He also became a surgeon and was to be found in Whitehaven with his brother Charles in a few census.  He died in 1950 in Leytonstone, Essex.

Do you think Sampson was away a long time between the birth of Sarah Hannah and Sampson Edward, or are there more children somewhere?!

I have the dertificate, it's Mary Maunder, why can't it all be simple.

Yes, I have marriage to Mary and 1861 census, baptism etc all I really need is marriage to Charlotte Augusta and the whereabouts of them in 1851.  I am grateful for any help!

Sampson Harris was born in 1812 in Plymouth, son of John and Elizabeth Harris.  He was a chief engineer in the navy and the only census I have him in is 1861 when he has remarried and had more children with Mary Maunder.  He died in 1866.  I have his naval record but it shows no marriage, in fact it starts when he is quite old so I think there may be one earlier, can't find that!
Thankyou to everyone prepared to look!