hon I lost my mom 14 yrs ago and it was a terrible relationship. there were so many emotions that went thru me the minute she died that I didn't know how to act. take whatever time you have with your dad and forget about your differences. after all he is now 84. you don't have to agree with him on things but you don't have to verbalize it. just agree to his face and do whatever you choose. I think you would feel better after he is gone as well. I hope everything goes well with his biopsies.