Our 88 year old dad has been diagnosed with incurable advanced terminal cancer. My sister and I will have joint Power of Attorney once he passes away or becomes incapacitated. We will be seeing the family solicitor next week to talk over the situation and put measures in place. My sister (aged 63) is bipolar, and the upset of our dad's diagnosis has sent her into a manic phase. She hasn't had an episode for ten years, but this is a bad one and it could last for six months or more. More than likely, she will be this way when our father passes away, and his death will be even more stress for her. How does her condition affect me being able to handle the finances etc? She may get even worse as he progresses. Can I proceed with what needs to be done (selling the house, funeral finances) if she is incapacitated, AWOL, or changes her mind about selling the house? (I am financially stable, she is not, but the house has 6 bedrooms and she couldn't pay the bills to run it) I love my sister dearly, but at the moment she is lost to the mania, and incapable of even having a normal serious conversation. Obviously I will be discussing this with the solicitor, but I am hoping someone can give me an idea of what can be done. Our father is very upset by his daughter's deteriorating mental health and I am increasingly stressed and concerned about what lies ahead. She is very intelligent and doesn't miss a beat. She currently gets extremely upset and angry if her mental health is mentioned (even in the kindest way) or if she is gently asked to calm down, so we are tip-toeing around her.