Shelly,
DONT listen to his brother, walk away if you have to, you know how high emotions run when you are dealing with the thought of maybe losing a loved one( I did say maybe). You have done exactly what your dad asked of you and that is all anyone can do..What do they think that you gave your dad a drug that gave him LC, I mean really, Do they think LC is contagious, I dont understand why they are blaming you for his illness. It sounds to me like you are not going to make his family happy no matter what you do.
Dont worry about them, you have to worry about you.. I know how hard this is for you, you do with your dad what you feel is right..If you want to be there near him, you be there, that is not smothering him...
If you read this tonight you can call me...I will be home all night with nothing to do so dont feel like you are bothering me..Okay?