Q: what is the specific law regarding a landlord's agent giving 24 hour notification. may that agent specify a weeks window

A: Anyone can act on behalf of your landlord IF, and only if, they have your landlord's permission or direction to do so. That said, the law is that they have to provide at least 24 hours advanced notice of their intent to enter your premises, so a week in advance is likely lawful in Oregon. But "might" be or not providing a reasonable timeframe would not be acceptable to me if I was the tenant. You are free to deny entry anytime they give you a notice, so long as you do not do so unreasonably. So I would just tell the brother, "no, that doesn't work for me, do not enter. If you want to provide me a more concrete date/time when you WILL be here, I will try to make that work in my plans". The whole point of the notice requirement is to allow the tenant an opportunity to arrange to be there while someone else is going through their home - and unspecified times, on a "maybe" basis, simply is not reasonable of their part and does not allow you to make firm plans one way or the other. If you ever do deny entry to the landlord or their agent, I recommend providing them an alternate date/time that does work for you - "No, Tuesday afternoon does not work for me so please do not enter then but Saturday between 2 and 5 p.m. will work for me. Will that work for you too?" That way, they will have a devil of a time convincing a Judge, if it ever came to that, that you were being unreasonable in your denial of entry. A landlord cannot just dictate when they will enter; it has to be a mutually negotiated process. Good luck.