I would try to be polite and as emotionally neutral as possible. People don't always react the way we think they will but, at the same time, if you broadcast your negative expectations too much, some people will react to that even if they would otherwise not have been all reactionary. There is a scene in "While you were sleeping" where the character played by Bill Pullman finally tells his dad that he doesn't want to inherit/takeover the family business. He has been avoiding it for years, while pursuing his real dream on the side. His dad is like "If you had told me sooner, I could have sold it to your uncle". It's very, very anticlimactic, involving none of the emotionalism or drama that Bill Pullman's character feared.

Good luck with this.