I guess if i were you i would try to break it to them gently and gradually over a period of time....you know sort of slowly building on the previous info you have given them. Emphasize how much they can do to effect their health. If you make it seem like something they have power over it will be much easier for them. If it upsets your mom to hear you talk about it, i would suggest that you go on a walk to the park or grab a mocha at a cafe with them privately. Try not to blame your mom when you discuss it with them. Try to help them understand that it may be painful for you mom to think of them as having a genetic disease and so it might be easier for her to believe that they don't have it or are better off without doctors. I think that being gentle, compassionate and supportive of your mom is the best way to win her over at this point although i COMPLETELY understand how angry you must be with her (and you have every right to be.) Unfortunately i don't think anger or blame will help you get the outcome you desire. It will only antagonize her and cause her to strenghen her stance against you and alienate you from her (and possibly the kids). On the other hand it may be that no matter how gentle and compassionate you are towards your mother, she wont budge but at least she won't have much to go on for building a case against you.
Also do they like sports or any sort of exersize....?? I really believe exersize is HUGELY important in keeping CFer's healthy. If this is something they already enjoy then it is a great way for them to motivate them to take care of their health. Of course, if they haven't been treated in a while and have bad digestive problems they might feel exhausted and tired.... so they might need enzymes to get them nutritionally on track before either of them could imagine exersizing.
Also do they like sports or any sort of exersize....?? I really believe exersize is HUGELY important in keeping CFer's healthy. If this is something they already enjoy then it is a great way for them to motivate them to take care of their health. Of course, if they haven't been treated in a while and have bad digestive problems they might feel exhausted and tired.... so they might need enzymes to get them nutritionally on track before either of them could imagine exersizing.