By Eve Wagstaff Grief can do crazy things to someone’s mental health, causing them to shut down all rational thoughts. But one woman has revealed her dangerous situation after discovering that her mother wants her to marry her dead sister’s husband. Sharing the terrifying situation on social media, she wrote: “I am beyond appalled, disgusted and just f**king shocked. I’ve got no one I can tell this to yet, and I need to get it off my chest. “Four months ago, my sister, 27, passed away and left behind her six children. Collectively, we have done our part as a family to help them regain normalcy…