Why does my family just think they can take over my life?

My dad has been in long-term care for about a month now. My mom is in the house by herself at the age of 80 years old. I will be moving in with her in two months time when my lease runs up but meanwhile I have so much stuff to do and getting ready to move that I am just physically worn out every day. Now my mom just had a a fall the other day and is in the hospital. She has no broken bones or other injuries but they’re going to keep her for a few days for observation. The rest of my siblings have decided that they are worried, as am I, about when she comes home again to an empty house. The siblings have decided that I should move in with her earlier. The problem is I’m nowhere near ready to do that for a ton of reasons. I don’t want my mom to be alone in the meanwhile but at any rate I work two part-time jobs so I wouldn’t be home throughout the day either way. We are looking at getting her a Life Alert but they think that that won’t be enough and they’re probably right. All the same I cannot put my poor health in jeopardy from trying to pack everything up in two days time and be ready to move. Why do they think that they can all just dictate to me what to do instead of everybody chipping in to help with the situation? I know I am the only unmarried sibling and I guess they figured that’s why I should be the one to turn my life upside down. Don’t get me wrong, I love my mom. I just can’t make things happen overnight nor do I have the money or resources even if I could magically finish packing up in no time flat.