(((christy))) I can only imagine! If you can, you might look into some bereavement counseling. It helped me so much. families get a little wound up during chronic/ terminal illness. There's Life Transition counseling too, your local hospital might be able to give you some names. maybe your sister and you go? It's not a long term counseling, usually about four to six sessions, just to help get over some of the hurdles.
Love from Lenina