The more I read this thread and all the other threads about Robert Campbell Murray the more muddled and confused I get.
You seem to be picking John Murrays at random and trying to make them fit.
I believe that you wish to ascertain the identity of the father of Robert Murray Campbell, illegitimate son of Annie Melville Campbell, who was born on 21 December 1921 in Stirling?
Robert had an illegitimate (half-?)brother, John Murray, born 17 July 1925 in Stirling to Annie Melville Campbell. On this occasion John Murray signed as the child's father. The father of an illegitimate child can only be named on the birth certificate if the father accompanies the mother to the registrar's when she goes to register the birth, and signs the register at the same time as she does. The birth is then indexed under both surnames. Therefore there is no doubt that John Murray acknowledged himself to be the father of John born 1925.
In 1931 Annie Melville Campbell marries John William Buchanan Wilson. He dies in Larbert in 1949, aged 53.
The Certified Copy of their Entry of Marriage on 12 August 1944; Registration District FYLDE in the County of Lancaster. Column 2: John Murray Seaman (Merchant Service) , Annie Melville Campbell Housekeeper. Column 7 (Father's Name and Surname) was blank. Column 8 (Rank or Profession of Father) was also blank. Signed by Registrar of Marriages Robert J. Waring.
This makes absolutely no sense whatsoever. On the face of it, this is the marriage of the parents of Robert Campbell Murray and John Murray, but that can't be the case because as far as we know Annie Melville Campbell was by then Mrs John William Buchan Wilson.
According to FreeBMD there is no record of the marriage of either a John Murray, or an Annie Melville Campbell in Fylde in 1944. However
Robert M Campbell married
Catherine I Lonsdale in Fylde in 1944.
So the above transcription of the marriage certificate is incorrect and therefore irrelevant.
If Robert did not name John Murray as his father when he got married, in spite of the fact that John Murray was the father of Robert's (half-?) brother John, born 1925, this must call into question why not. Did Robert really not know the name of John born 1925's father, when John born 1925 did know who his father was? Or did he know that he was
not the full brother of John born 1925? In which case his father was not John Murray at all, which would be why he didn't name him on his marriage certificate.
I have one person to verify before I go look up the Marine Return. This person was about the age of John Murray. I am in the process of gathering information on this new person. So I should have more details to share later today. This John Murray was known to Mr. John William Buchan Wilson the wife of Annie Murray Campbell.
Can you clarify this please? How do you know that 'this person', whoever he was, was known to John William Buchan Wilson?
(I assume you mean 'the husband of Annie Melville Campbell' rather that 'the wife of Annie Murray Campbell')
John Murray was born 7 July 1898 in Saint Ninians, Stirlingshire, Scotland and died in Waitakere, Auckland, New Zealand according to a relative .... To our knowledge John Murray was an engineer. He was a seaman in the UK merchant service and he may have died at sea.
He can't have died at Waitakere
and at sea.
Why does the relative think he is the John Murray who died at Waitakere, and where does the information come from that says he was a seaman and may have died at sea?
According to the official New Zealand deaths index none of the seven John Murrays who died in New Zealand in 1980 was born in 1898, let alone on 7 July 1898; and none has the middle name Campbell. There is one death of a John Campbell Murray in New Zealand, born 3 January 1914, died 1972. So it looks as if (yet again) Ancestry is providing disinformation.