Always The Little Sister

I am the youngest of 5 and there is a big age gap between me and my siblings. They always treated me like a little kid no matter what age I am. But they have gone to far this time. I live with our mom until I can employed. She has had a stroke and has dementia. I help with everything around the house and even do everything financial for her. Plus, she has a nurse that comes in to help. My eldest brother and older sister, along with a aunt went behind my back and are trying to put my our mom into a nursing home. My brother finally told me I better figure out what I am going to do or I am going to be homeless. I have a job interview at the end of this month in another state. I told him we should wait to see if I got the job or not. He told me no. Now I am all stressed out and applying to everything I can find. I have my masters and I have been looking for work for the last year, only be told that I am either over qualified or have to much education at interviews. Our mom is also stressing out cause she doesn’t want anything to happen to me and wants be to be in a stable situation before going to a nursing home. I have no clue what to do on a short notice.