Bill, Julia,
Many thanks for your replies. Unfortunately my copy of the family (GREVILLE) history is with my parents but I should get hold of it fairly soon. However, what I can say is that Sydney has researched the family tree right back to 1401 which is quite impressive! He had quite a lot of trouble finding information out about the Halpins in Ireland due the equivalent of Somerset House, let's say, suffering a mishap and records being destroyed! However, as I recall, Kilmainham Estate was in Dublin and I do not think it has anything to do with the gaol.
Sydney suspected that there was a branch of the Halpin Greville family in Australia and asked my sister, Monica, to have a look through the Sydney (Australia) phone book for Greville's! Lorne was one of the few Greville's that were listed By extreme coincidence, he had also been researching the family tree so the two started to communicate (by post as the web and e-mails were not around in those days!) Lo and behold, the two parts of the tree dovetailed perfectly!
Lorne is active on GenForum and was the first site that came up when I Googled 'Lorne Halpin Greville'. I am sure he as well as I would be very interested to find out more about the Halpin connection as it has been in the Greville family for over 200 years. I will try to send him a message.
Richard