Trouble?

I was outside mowing the yard this morning, when Maude disappeared. I stopped the mower and told Joshua go inside and check on his sister, make sure she is ok. His response, not typical of course, "Make sure she isn't getting into any trouble, like stealing your jewelery?" What? Why would he say that? Is that what trouble is to him? Have they stole my jewelery before? Why would he say that?!? Where would he pick that up...?