I was persuaded by my siblings to sell my house and move into mum's large house with my kids as she's getting elderly.
I forgot how spiteful and nasty she always was, I got caught up in the moment. Now I bitterly regret it.
Sorry op, it sounds like you are in a very difficult situation, and it’s not good that your that your dc are unhappy, or that your mum has Alzheimer’s, all of that is a lot to cope with.
However, some things in your post seem at odds with one another and I suspect there may be more to this scenario than you are saying. Forgive me if I am wrong but moving house with dc takes far longer than “a moment”, you would have had reasonable time to contemplate this move and assess the pros and cons for you and your dc.
And presumably you wouldn’t have left a situation where you were very happy?
And who forgets how spiteful and nasty their own mother is? Surely you would remember something like that?
And who gives their siblings that much power over their lives and that of their dc?
I suspect that you moved in because you thought the arrangement would be beneficial to you and your dc in some way, and you are now finding it too hard or unpleasant.
And that’s fine to change your mind, but at least be honest about it, as you will find life easier if you take responsibility for your own mistakes.
I can well believe that your siblings are not helping as this is a common scenario.
The obvious question that springs to mind is why are you posting for permission to move out? Why do you need permission from strangers on the internet or from your siblings? Why are your siblings dictating what you do in your own life?
Unless there is some cultural issue at play here and you are the only female in a family of males or there is some other factor you haven’t mentioned, such as they help you financially, or your siblings thought that you and your dc needed secure accommodation for some reason, then you are in control of your life and no one else. And you are the responsible parent making key decisions for your dc.
So why are you stuck? Is it guilt? Fear? Obligation?
If you can afford a small house and you think you and the dc can manage there, go and buy it, and inform social services of your parent’s care needs and ask for an assessment, and inform your siblings that that is what you are doing and say you want to talk to them about forming a rota of when each of you will be visiting your mum. Don’t ask, just do it. Good luck,