I think it is great to lead by example but you are still fresh yourself, and the stress of it all might tip you over, which will not help anyone. You do not say anything about who else is in the house, your work situation or if you will both be together all day. I also wonder if you will be supporting your brother financially to a degree as well.
I found the first 90 days very intense and I was thinking about the whole alcohol/recovery thing constantly.