I have been doing a genealogical tree of the Beatles that I have tried to make as accurate as I can, and actually has been looked at by a famous Beatles author (I correspond with Mark Lewisohn). I will gladly give you the address of the Lennon tree, which has many descendants of all the branches (http://trees.ancestry.com/tree/52687931/family
). I just invited you to my tree. Please feel free to let me know what needs to be corrected and what is inaccurate. I am always happy to help other researchers.