Having gone through something similar about a year ago, my only advice would be to have faith that God is in the details of yours and your sister’s life. My brother-in-law unfortunately passed away and left behind my sister with their 6 kids, ranging from 5 to 17. It has not been easy to say the least. I’ve always felt peace when my thoughts turn to God and I hit my knees in prayer. I’ve also always felt despair whenever I think to blame God or want to cease to believe that he exists. Choose peace through the Savior, my brother, and have hope in God’s plan no matter the outcome. I don’t know you, but my heart goes out to you! Much love!