Thanks to yourself and Joyce on the Dublin City site I think I now know that this Patrick is not "mine" Joyce's research found that John F Clinch was born in 1903 and the family were on the 1911census living at Cookstown Skreen Co. Meath. She suggested I write to Deansgrange asking who bought the grave but I don't think that will lead me anywhere. Patrick and Kate Reardon's whereabouts still remains a "mystery" as with others in my research. Thanks a million for your interest.
Shelagh.