Huh?
Okay, I don't mean to be thick but the whole thing seems weird.
I'm going to make some assumptions, tell me if I'm wrong.
They
don't ask for:
- personal articles of clothing (underwear)
- garbage (old candy wrappers, banana peels)
- anything else?
And they ask for everything else? I don't get it. Like I said, maybe I'm being thick about it, but are they asking for things back that they've given you? I guess it's the whole thing about the trash that's throwing me. Also, when you come there, I have to assume you don't pack your entire house. It should be obvious that if you're staying for 3 days and have 3 shirts packed that you need them all. Can't just a simple "No, I'm using it." suffice?
Would it work to have something to give them -- anything -- to get them off your backs, or would that arouse their behavior even more? By that I mean, give them a sweater and then they're happy for the rest of the visit, or do they constantly needle you?
If they continually needle, some of that seems like it's not quite right in the head. Tell me, is their house a huge jumbled mess of material possessions? If so, it may be a case of Collyers' Mansion. See:
http://en.wikipedia.org/wiki/Collyer_brothers If that's what's going on there, then it can be a symptom of obsessive-compulsive disorder.