Greta, come post on the Daily board to get more responses. And welcome, by the way. Also, on Sunday and Tuesday nights there is an online support group meeting here (click on link to the right).
You are dealing with a serious hoarder and must expect the irrational. Why is no one else helping you clear or clean the house? Under National Resources (above) you can find perhaps some resources. The paid-for cleaners typically run over $2000 for an average home, sometimes much more. If your bro wants to buy the house, why not get him to pay for the clearing out?