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Right - his marriage certificate states his father was called Thomas Casey and that his father's occupation was 'male nurse'.
His residence at the time of marriage is Catterick Military Hospital in Richmond.
They were married in the parish church of St Oswald Catterick Camp.
Married on 18th July 1953.
Where do I go from here ? 

Hi,

This is a very long shot but I'm trying to do my family tree and I'm stuck at my Granddad!
He always told us his name was Patrick Joseph Casey. When I received his marriage certificate (Married Richmond, Yorkshire Aug 1953) it states his name was Kevin J Casey?
He rarely spoke of his past let alone his family, although my mother believes he always said he had a sister called Margaret whom he loved dearly.
His date of birth is 30.10.1930 (Or so he has told us) - He said he was born in County Longford, Ireland, and that he traveled over here in his teens.
I do have a photo of him in military clothing (I believe he was at Catterick Garrison, England for some time) but he was never in active service.
Can someone guide me as to where I even begin looking? I'm on Findmypast but I have not been able to find anything - searching for a Casey in Ireland is proving to be a nightmare 

Any help is very much appreciated!

Laura