..and then she ll throw it into the trash, sell it, or lock it in her trunk. She's reaching 30 and still lives at home. I share a room with her, which makes it easy access to steal.. You would think that at her age, she wouldn't be acting like a little immature kid. And I already confronted her in a mature way about her stealing habit, but that didn't even work. I have most of my stuff locked up, but she will steal literally anything; and the bedroom will look like a empty spot on my side,.. if I have to lock up my pics, posters, blankets, pillows, ect. Does anyone have advice on how to deal with her?