I don't know any way to hurry grief.....you just have to go through it. I am so very sorry about the loss of your sister and the worry you have for your parents. One of my sisters has a serious disease and I worry about something happening to her, just can't imagine how it must feel.
I just returned from a week with my Dad, who's health is failing. I'm retiring this year, probably earlier than I should, but I want to have more time for family......I won't have any regrets. Hugs.