I've taken the liberty to send Kreacher to their rooms and their things are still here.
There is another big problem. Why is anyone going to listen to us if they don't? Theo wanted to go out, apparently comments were made that he should have and this is my guess based on your father's response, and your father decided that he'll beat everyone and do it himself. If they do what they want, why should anyone listen to any of us?
Is there anyone who will get the respect of everyone else? I fear that the answer is no, no matter what we do, but making an agreement without transparency will create even more problems. People don't want to do the work but will complain when you make decisions for them.