Hi Martin
I had a very difficult and similar situation with a half brother(and subsequent sister and 2nd brother!) I think that you have to act as if you are treading on egg shells and as others have said keep your communications very vague,some thing like you may share the same family line.However I would say go ahead as nothing ventured nothing gained so to speak.I now have a new half sister that I did not know about for 55 yrs !Good luck. Iola.
