This the only Harry Roger Ransom i could find in Kent. There are some Harry R Ransons.

Do you know who he married ?

England & Wales, FreeBMD Birth Index, 1837-1915
Name: Harry Roger Ransom
Date of Registration: Jul-Aug-Sep 1873
Registration District: Medway
Inferred County: Kent
Volume: 2a
Page: 469

This might be your Harry.

"England and Wales Census, 1881"
Name: Harry R Ransom
Age (Original): 7
Gender: Male
Birth Year: 1874
Birthplace: Chatham, Kent, England
Relationship to Head of Household: Adopted Son
Marital Status: Single
Occupation: Scholar
Address: 7 Wood Street
Event Place: Chatham, Kent, England
Record Type: Household
GS Film number: 1341212
Affiliate Publication Number: RG11
Piece/Folio: 893 / 6
Page Number: 6

Head Thomas Hawkins M 49 Dorilly, Buckinghamshire, England **
Wife Hannah Hawkins F 39 Black Notley, Essex, England
Son James Hawkins M 20 Braintree, Essex, England
Son Walter Hawkins M 15 Braintree, Essex, England
Harry R Ransom M 7 Chatham, Kent, England (Adopted Son)
** Occupation: Army Pensioner
................................................................................

There is this marriage for a Harry Roger Ransom. Not sure it is yours.

London, England, Marriages and Banns, 1754-1921
Name: Harry Roger Ransom (occ Book stall clerk)
Estimated Birth Year: abt 1874
Age: 26
Spouse Name: Clara Florence Carro
Spouse Age: 26
Record Type: Marriage
Event Date: 16 Apr 1900
Parish: Tottenham St Ann
Borough: Haringey
Father Name: Nathan Ransom (dec Corporal marines)
Spouse Father Name: Alfred James Carro
Register Type: Parish Register

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I coul not find Harry Roger Ransom after 1881 in census. Assuming the birth reg is your Harry the only way you will find his parents names is to purchase the birth cert.

This looks like the family of Harry in the marriage above. I would still get Birth cert before trying to go farther back. I cannot find a death for Nathan before 1881.


Marriage

Groom RANSOM, Nathan Ranson
Bride: RANSOM, Sarah Ransom ??
Date of marriage: 22 October 1868
Town: Corringham
County: Essex
Series: ADM183 - Royal Marines, Chatham Division:
Order, Discharge and Letter Books, Registers and Returns
Box: 0114
Folio: 42
................................................................

1871 England Census
Name: Nathan Ransom
Age: 36
Estimated Birth Year: abt 1835
Relation: Lodger
Spouse's Name: Sarah Ransom
Gender: Male
Where born: Lidgate, Suffolk, England
Civil Parish: Chatham
Ecclesiastical parish: St Mary
Town: Chatham
County/Island: Kent
Country: England
Registration District: Medway
Sub-registration District: Gillingham
ED, institution, or vessel: 28
Household Schedule Number: 107

George Barley 24
Lavenia Barley 24
Frank Barley 4 Months
David Havard 29
Ann Havard 19
Nathan Ransom 36 (corporal marines)
Sarah Ransom 26
Eliza Ransom 1

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1891 England Census
Name: Sarah Ransom
Age: 45
Estimated Birth Year: abt 1846
Relation: Head
Gender: Female
Where born: Lidgate, Suffolk, England
Civil Parish: St Marylebone
Ecclesiastical parish: St Stephens
County/Island: London
Country: England
Condition as to marriage:
Registration District: Marylebone
Sub-registration District: St John
ED, institution, or vessel: 10

Sarah Ransom 45 widow
Eliza Ransom 21
Harry Ransom 17 (occ book stall clerk)

Thank you for your speedy response :-)
I have some of the information above but will plough through it with what I have already.
I believe Harry was adopted by by Great Grandparents and would like to gain more info about this and where he ended up etc..
Once again, Many thanks, I shall get back to you if I need info on anyone else as you obviously know what you are doing, where as I am still learning!