You don't need to do anything at this point.  When you or your brother are served with the appeal, then you will need an attorney to respond. A notice of appeal just means that an appeal will be filed in the future.  There are time deadlines for filing the notice of appeal and that is why it was filed.  It may be that the opposing party is filing an appeal against your brother, but without knowing more information or seeing the actual notice of appeal, I can't be certain of that.It is also possible that the notice of appeal is being filed by someone on behalf of your brother, but again without seeing the actual notice and knowing more facts, I can't be certain of that.