Well I have ADD so does my step-mom, dad, and best friend. I asked them (with out knowing the reasons)and they said the same thing (which I agree with) try it out. people are sometimes are in shock when all of a sudden they can't "walk all over you" anymore. One thing you can try is to ease them into things. Don't just leave it at no. Give some justification. Try saying not right now, I just really can't see doing........,I have......to do, stuff like that. Hope these suggestions help.
~me~