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I have found John Martin born around 1850 in the Uk census working in Liverpool . He puts his place of birth as Sligo.
I have been searching for my John who's parents were John and Margaret in Dublin records.
He had a sister Charlotte who was born about 1843.
I can find no marriage for his parents or baptismal cert for Charlotte in Dublin, which has me looking outside of this area.
The John I am searching for was a tailor as is this one. I may be a long way off the mark but I am at a brick wall in Dublin. The records on IFHF do not have  a Charlotte or John born with parents John or Margaret.
Any suggestions  Are all the records on line for Sligo through IFHF ?
much appreciate any help you can offer

The search engine on the Glasnevin website is very inflexible, allowing only a search by name (though you can use initials) and time period - no searches by surname only or across all years and definitely not by grave number.  I inquired a good while ago about the original purchaser of a specific grave.  I was told that the records could be dug out but that it would cost €50 (if I remember correctly).  I'm a little surprised, therefore, that you have not received a reply.  Have you phoned Glasnevin (tho' if your monniker is a clue to your location, that could be expensive) ? 

I have tried but I was told the inquiry had been pass on for action but again heard nothing . I wrote again and told them I had written a number of times but have heard nothing back. I have tried to search for the year but the name of my GGGF was John Hayes. he bought the grave but I am not sure if he is buried there or if so when he died. You would think that being the holder of the original papers and also a gggd I would have some entitlement to be able to obtain this information from the grave number.I visited both GB & GN in 2009. Found the woman in the office very unhelpful. She suggested I get on the net even though I told her I had travelled from Australia to visit the grave and just wanted to know who was buried in that grave.because I could not get the imformatuion from the records as they didn't work on grave numbers.
 The caretaker at GB was great but the spot where the grave is just happened to be where all the rubbish was piled up and I could not see if there was any headstone. I am hoping to make another trip back to Ireland maybe next year

Hi Eamon
Yes that would have been my Dad Kevin Martin. Sadly he died in Sydney of a massive heart attack. He was indeed related to that famous Eamon Martin. Eamon was a younger brother of John my grandfather.  When did your family leave Roscommon? 

Thank you both for the information. I am still unsure if I Ann Behan  is the mother of my Mary Doyle. The other Doyles were at St Andrews and the Kavanagh's lived in this parish . The family story is that the GGM was from the north side which fits with St Lawrence Parish but ? 
There were also 2 sets of Michael & Mary Kavanagh living in the Clarence st area in the 1901 census.  I believe the couple born in Arklow were Michael's parents.
The Doyles were living at Queens Sq too in the Parish of St Andrews in 1901. The wife is dead, as it list Thomas as a widower and the girls Francis and Anna are single. Mary & Michael her husband with my gf baby Michael are living there too.
I will have to get a copy of the marriage cert and see if it gives anymore details about the parents. I just have a feeling that the 1898 marriage listed in Irish genealogy.ie is not the correct one. I will alos try and get copies of Birthcerts as you suggested. Again Thanks for the help.