Robert Hunter Smith - Birth parents?

[Brighton06]

I was hoping that someone is able to help with my query.
The above was my Grandfather, i obtained his birth certifcate which confirmed what i knew that he was born in Kirkcaldy.  His birth date was different however from what we had celebrated. The names of his parents were John Smith and Elizabeth Smith (maiden name Hunter)  I have then obtained the marriage certifcate in 1938 when he married my Grandmother to find that the names of his parents had changed to Henry Smith and Maggie Jane Smith (maiden name Hunter).  I am aware that John Smith had a younger brother called Henry. My question is, is there anyway that i could find out for definite who was his natural birth parents?
Thanks in advance

[DDJJake]

Hi
It looks as if both John and Henry named their sons after the same person - probably their father (Scottish Naming tradition) and if your grandmother married the RHS with parents Henry and Maggie, this is your man. Your Kirkcaldy born RHS was probably your Grandad RHS's cousin.
Here are the births of the only [five] Scottish RHS's of marriageable age in 1938.
1906 ROBERT HUNTER SMITH M CAMLACHIE GLASGOW CITY/LANARK 644/02 1670
1909 ROBERT HUNTER SMITH  M LEITH NORTH EDINBURGH/MIDLOTHIAN 692/01 0290
1910 ROBERT HUNTER SMITH  M MUIRAVONSIDE /STIRLING 486/00 0108
1913 ROBERT HUNTER SMITH  M KIRKCALDY AND ABBOTSHALL /FIFE 442/00 0047 
1917 ROBERT HUNTER SMITH M MUIRAVONSIDE /STIRLING 486/00 0038

Was your Great Great Grandfather a Robert Hunter Smith ?

Aye
DDJJAKE

[DDJJake]

Hi
Just checked the marriages of John Smith and Henry Smith.
They have the same parents George Smith and Elizabeth Main
Maggie's father was Robert Hunter, but Elizabeth's father was George Hunter.
So Henry is your Great Grandfather and John is your Great Grand Uncle.
If you wish these marriage registration images, let me know on this board and I will personal message you with my e-mail address for you to contact me, if you wish, so that I can send you them by e-mail attachment. ... and any other help back your line into the previous centuries if you need it.
I am an ancestry.com subscriber and, despite its difficult indexing, I can use it to complement the pre-1875 Mormon site, and my CD-ROM of pre-1855 Fife Deaths etc etc.
Aye
DDJJAKE

[DDJJake]

Hi again ...a wee help back in time ...
1901 Scotland Census  Henry Smith born: Edinburgh
Aged 13  Son of George with mother Isabella Main
Residence  Auchterderran  Fife
Address: Dothan Cottages
Occupation: Scholar
George Smith 45 Head b. Pencaitland
Isabella Smith 47 Wife b. Falla [near Soutra, I think]
Euphemia Smith 19 Newbattle daughter
Isabella Smith 17 b. Lasswade daughter
John Smith 15  b. Gorgie son
Henry Smith 13  b. Edinburgh son
George Smith 9  b. Newbattle son

Aye
DDJJAKE