I have been her primary caregiver for the past 6 years and have worked full time. I am about to retire and want to keep her at home but they have suddenly put her in an assisted living facility. I am already seeing her decline and want to bring her back home and use sitters until I retire in 4 months, and then I can move in with her. I live across the street from her so have very easy access. She does not need 24/7 care at the moment but does need help with many of her daily tasks. She was steadily improving from a fall back in September, and I wanted to postpone the move until I really could not provide the care she needed. They have completely shut me out of the decision making though i am the only one living in town and am the one to go check on her daily.
Even with help, it will still be the hardest thing you've ever done.
Maybe your siblings want to save you from doing the work of three full-time caregivers. You have been her primary caregiver but it sounds like you haven't needed to be a hand-on caregiver, thus feeding her, bathing her, helping her to the bathroom, keeping her from leaving the house, being up all night while she wanders around the house, etc.... right now it seems simple to care for her but that could change rather quickly.
What to do, take your siblings advice and put Mom in Assistant Living. Some day you will realize your siblings were looking out for your own best interest. One out of every 3 caregiver dies leaving behind the love one. Those aren't good odds.